Category: Physics

Physics Year 12 Random Retrieval

This quiz contains all the questions in the Physics Year 12 section. The website will pick 10 questions at random.

1 / 10

Identify the independent variable: Investigating the absorption of gamma radiation by lead

Radiation Source

Thickness of Lead

Count rate of radiation

2 / 10

Which is the SI unit for temperature?

kelvin

celsius

fahrenheit

3 / 10

Which is the correct definition for acceleration?

The rate of change of an object's displacement.

The rate of change of an object's speed.

The rate of change of an object's velocity.

The rate of change of an object's speed, squared.

4 / 10

Select if the following is a scalar or a vector: speed

Scalar

Vector

5 / 10

Which of these expressions is not a correct expression for calculating the electrical power of a circuit?

Expression A

Expression B

Expression C

Expression D

6 / 10

The unit for potential difference is Voltage, what is this in SI base units?

m² kg s^-3 A^-1

A s

J s^-1 A^-1

7 / 10

Calculate the the time taken for a current of 5.2 mA to reach a charge of 25 C.

0.13 seconds

4.8 seconds

2 minutes 10 seconds

80 minutes 8 seconds

8 / 10

A stress-strain graph is shown above for an unknown material. Where on the curve would you mark the UTS point?

9 / 10

What is meant by the threshold frequency for a metal?

The frequency of light required to cause electrons to eject from any metal at the speed of light.

The frequency of light required to cause electrons to eject from any metal.

The frequency of light required to cause electrons to eject from a specific metal at the speed of light.

The frequency of light required to cause electrons to eject from a specific metal.

10 / 10

What is 1.7334 x 10³ to 3 significant figures.

1.70 x 10³

1.7 x 10³

1.73 x 10³

1.730 x 10³

Your score is

Waves and the Nature of Light Random Retrieval

Waves & the Nature of Light Random Retrieval

This quiz contains all the questions in the Waves & the Nature of Light section. The website will pick 10 questions at random.

1 / 10

The h in E = hf represents:

Number of photons

Planck constant

Boltzmann constant

Intensity of light

2 / 10

The Young’s double slit experiment is an example of light as a __________.

Wave

Particle

3 / 10

If the intensity of incident light was increased on a surface where electrons were already being emitted what would the effect be?

More electrons are emitted from the surface of the metal

Nothing

The same amount of electrons will be emitted from the surface of the metal but with a greater kinetic energy.

Less electrons will be emitted from the surface of the metal but with a greater kinetic energy.

4 / 10

What is the effect on the emission of electrons the frequency of the incident light was increased?

More electrons are emitted from the surface of the metal

Nothing

The same amount of electrons will be emitted from the surface of the metal but with a greater kinetic energy.

Less electrons will be emitted from the surface of the metal but with a greater kinetic energy.

5 / 10

Select the missing word: "For ultrasounds, ________ wavelengths produce clearer images".

Shorter

Longer

High amplitude

Low amplitude

6 / 10

Fishermen use sonar to detect the depth of fish beneath the boat. On this occasion, the echo returned after 0.83 s. The speed of sonar waves through water is 1500 m s^-1. Calculate the depth of the fish.

180.7 m

553.3 m

1245 m

1807 m

7 / 10

Calculate the wavelength of a monochromatic light incident on a diffraction grating of 2.67x10⁶ lines per metre with an angle of 17° to the first order maxima.

5.40x10^-8 m

1.09x10^-7 m

4.54x10³ m

7.81x10⁵ m

8 / 10

Light passes from air through a glass container and into olive oil. Select the diagram that best shows this. Refractive indexes are as follows: glass = 1.52 and oil = 1.47

9 / 10

Light travels at 2.25x10⁸ ms^-1 in water, what is the refractive index of water?

0.75

1.33

1.59

10 / 10

Which condition is not necessary for the production of a stationary wave?

The waves are travelling in opposite directions.

An equal ratio of nodes to antinodes.

The waves are coherent.

The waves are in the same medium.

Your score is

Physics Random Retrieval Y12

Physics Year 12 Random Retrieval

This quiz contains all the questions in the Physics Year 12 section. The website will pick 10 questions at random.

1 / 10

A uniform plank GD has mass 13 kg and length 1.8 m. A mass 6.8 kg is attached to the plank at D. The plank remains balanced due two ropes attached The tension in the rope at G is half the tension of the the rope at A, calculate the tension in the rope at A. g = 9.81 ms^-2

59 N

130 N

234 N

469 N

2 / 10

A diver steps off the end of the 10 m board, free falls, then hits the water before travelling underwater 4 m in 2 seconds. Calculate his speed upon hitting the water. g = 9.81 ms^-2

5.09 ms^-1

8.00 ms^-1

14.01 ms^-1

19.62 ms^-1

3 / 10

Select the effect on V_out when the surrounding temperature decreases for circuit.

V_out increases.

V_out decreases.

V_out remains constant.

4 / 10

Calculate the total resistance of the circuit shown.

0.69 Ω

4 Ω

8 Ω

16 Ω

5 / 10

Which graph best represents the I-V characteristic graph of a NTC thermistor?

6 / 10

Select the missing word: "The shallower the gradient of a I-V characteristic graph, the ____________ the resistance of the conductor.

Smaller

Larger

Weaker

7 / 10

A smart phone has a charge flowing through it of 2 mC every 5 s. Calculate the current.

0.4 A

0.01 A

4x10^-3 A

1x10^-3 A

8 / 10

When the temperature increases, what is the effect on fluids' viscosities?

Gases become less viscous, liquids become more viscous.

Gases become more viscous, liquids become less viscous.

Gases and liquids become less viscous.

Gases and liquids become more viscous.

9 / 10

A stress-strain graph is shown above for an unknown material. Where on the curve would you mark the UTS point?

10 / 10

Which condition is not necessary for the production of a stationary wave?

The waves are travelling in opposite directions.

An equal ratio of nodes to antinodes.

The waves are coherent.

The waves are in the same medium.

Your score is

Working as a Physicist Random Retrieval

This quiz contains all the questions in the Working as a Physicist section. The website will pick 10 questions at random.

1 / 10

How many significant figures are in 0.056?

2 / 10

What is 0.0000176700 to 2 significant figures.

0.000017

0.0000177

0.000018

0.0000180

3 / 10

What is 1291 to 2 significant figures.

1000

1200

1290

1300

4 / 10

What multiple of unit does micro (μ) have?

1 x 10^-3

1 x 10^-6

1 x 10 ^-9

5 / 10

What multiple of unit does nano (n) have?

1 x 10^-6

1 x 10^-9

1 x 10 ^-12

6 / 10

Identify the control variable: Investigating the boiling point of different liquids.

Boiling point of liquid

Type of liquid

Volume of liquid

7 / 10

In the equation of a straight line, y = mx + c , select the letter that represents the gradient.

8 / 10

Select the missing word: _______ errors affect precision.

Random

Systematic

9 / 10

The radius of a cheesecake in the staff room is 7.5 ±0.5 cm, what is the percentage uncertainty for the area of the cheesecake?

3.34%

6.67%

13.34%

44.49%

10 / 10

Calculate the percentage uncertainty of line c (dashed).

4.3%

5.9%

11.4%

54.6%

Your score is

Mechanics Random Retrieval

This quiz contains all the questions in the Mechanics section. The website will pick 10 questions at random.

1 / 10

A window cleaner leans her ladder against a vertical wall in order to start work. The ladder has a length of 6 m and mass of 15 kg, she places it at an angle of 50°. Calculate the reaction force from the wall at W. g=9.81 ms_-2

8.9 N

61.7 N

87.7 N

123.5 N

2 / 10

The diagram shows a swing 1.43m long. Matilda has a mass of 35 kg and is released from rest at position A by Miss Honey. Calculate the speed of Matilda at position B.

1.94 ms^-1

3.75 ms^-1

6.5 ms^-1

14.1 ms^-1

3 / 10

Select the SI unit for Power.

Js^-1

m kg s^-1

m²kg s^-2

m²kg s^-3

4 / 10

Physical Disability Rugby League (PDRL) is a format of rugby league for those with impairments. Anthony Seward (Warrington Wolves) has a mass of 70 kg and Sam Zeller (Leeds Rhinos) has a mass of 65 kg. Anthony is at rest and Sam runs towards him at a speed of 8 ms^-1. They move together in the same direction, calculate at what speed.

0 ms^-1. They do not move.

1.45 ms^-1

2.8 ms^-1

3.0 ms^-1

5 / 10

Samantha Cristoforetti is an Italian astronaut. We can't find her mass online, so let's assume 60 kg. Where does she weigh the most at?

Venus

Earth

International Space Station (ISS)

Mars

6 / 10

Marvin the Martian fires his gun horizontally at Bugs Bunny at a height of 60 cm. It fires at 550 ms^-1, but misses. Calculate how far away from Marvin the shot lands. g_Mars = 3.71 ms^-2

67.3 m

177.9 m

192.4 m

312.8 m

7 / 10

An ill prepared student asks for a pen to write with in class, and the teacher grudgingly lends one out. Instead of walking over to the student, the teacher decides to throw them the pen. The teacher throws the pen at angle of 14° and a speed of 23 ms^-1. Sadly, the teacher misses and the pen continues on it's projected path out the window and takes 5 seconds to hit the car park outside.

Calculate the height different between the point of release and the car park floor. g_Earth = 9.81 ms^-2

95 m

96 m

112 m

123 m

8 / 10

There are exploration rovers on the Moon. One rover malfunctions and can't be controlled from Earth, it maintains a constant velocity of 8 kmh^-1 in the same direction. After some time it reaches the edge of a crater and goes over the edge, falling 300 m to the ground.

Calculate how long it takes to fall. g_Moon = 1.62 ms^-2

7.82 s

16.44 s

19.25 s

135.14 s

9 / 10

A train leaves the station and accelerates at a constant rate, a. After time t its velocity is v. What was the trains velocity at 4t?

[1] √4 v

[2] 0.25 v

[3] v²

[4] 4v

10 / 10

Select if the following is a scalar or a vector: momentum

Scalar

Vector

Your score is

Electric Circuits Random Retrieval

This quiz contains all the questions in the Electric Circuits section. The website will pick 10 questions at random.

1 / 10

The unit of resistivity is the ohm-metre. A correct alternative unit is:

AmV^-1

VmA^-1

VAm^-1

Am^-1V^-1

2 / 10

The unit of power is the watt. A correct alternative unit is:

VCs^-1

Ω²V^-2

V²Ω

V²Ω^-2

3 / 10

Select a use for this circuit in fluctuating light conditions. Assume V_out is the location of external circuitry

A fan to switch on in warm temperatures.

Street lights to switch on in darkness.

Operate a heater in a reptile house.

A speaker that operates upon sunrise.

4 / 10

Select effect on V_out when the light intensity increases on this circuit.

V_out increases.

V_out decreases.

V_out remains constant.

5 / 10

Select the correct potential divider equation.

6 / 10

Calculate the total resistance of the circuit shown.

0.62 Ω

1.6 Ω

5 Ω

15 Ω

7 / 10

Which of these expressions is not a correct expression for calculating the electrical power of a circuit?

Expression A

Expression B

Expression C

Expression D

8 / 10

Which graph best represents the I-V characteristic graph of a metallic conductor at a constant temperature?

9 / 10

If the area (A) of a material was to doubled, what would the resistance be?

R/2

R²

10 / 10

Calculate the the time taken for a current of 5.2 mA to reach a charge of 25 C.

0.13 seconds

4.8 seconds

2 minutes 10 seconds

80 minutes 8 seconds

Your score is

Materials Random Retrieval

This quiz contains all the questions in the Materials section. The website will pick 10 questions at random.

1 / 10

The ship, Queen Elizabeth 2, was a cruise ship from 1969-2008. She currently resides in Mina Rashid, Dubai as a floating hotel. When fully laden she held 70,327 tonnes and therefore displaces that weight of fluid when afloat. If the the density of seawater is 1024 kgm^-3, calculate the upthrust exerted on the ship when she was afloat fully laden. g = 9.81 NKg^-1

6.7x10⁵ N

6.9x10⁸ N

7.1x10⁸ N

7.1x10¹¹ N

2 / 10

A unknown material under load 75 N incurs an extension of 2.1 mm. The original length of the material was 1.75 m and it has a diameter of 0.45 mm. Which material is it most likely to be?

Acrylic

Gold

Nickel

Tungsten

3 / 10

The graph above shows a wire being extended by adding masses. Estimate from the graph the Young's modulus.

0.67 Jm^-3

1.50 Jm^-3

192 Jm^-3

384 Jm^-3

4 / 10

A material has a stress of 6x10⁸ Nm^-2 and is placed under a 5% strain. Calculate the value for the materials Young's modulus.

1.2x10⁸ Nm^-2

3x10⁹ Nm^-2

1.2x10¹⁰ Nm^-2

3x10¹¹ Nm^-2

5 / 10

Which material on the graph above is the stiffest?

6 / 10

Which material on the graph above is the weakest?

7 / 10

Select the graph with the correct labels.

8 / 10

The graph above shows a fishing wire being extended by adding masses. Use the graph to estimate the elastic strain energy of the material.

9.7 J

10.0 J

19.4 J

32.3 J

9 / 10

When plotting a force extension graph for the loading and unloading of a material, when would the unloading line not pass through the origin?

When the limit of proportionality has been passed.

When the elastic limit has been passed.

When a metallic material is used.

When synthetic material is used.

10 / 10

At which point on the graph shown above is the elastic limit?

Your score is

Waves & the Nature of Light Random Retrieval

This quiz contains all the questions in the Waves & the Nature of Light section. The website will pick 10 questions at random.

1 / 10

What happens when a ultrasound wavelength meets an interface in the body?

The ultrasound waves are reflected.

The ultrasound waves are transmitted.

Some ultrasound waves are reflected and some are transmitted.

Some ultrasound waves are absorbed by body tissue and the rest are scattered.

2 / 10

Where is the brightest maxima located?

zero order

1st order

2nd order

nth order

3 / 10

A blue laser of wavelength 480 nm is incident on a diffraction grating of 3.00x10⁶ lines per metre, how many order maxima (excluding 0 order) can be seen?

4 / 10

Reducing the width of a single slit that has monochromatic light passing through affects the central maximum, how?

The width and intensity both increase

The width and intensity both decrease

The width is unchanged but intensity decreases

The width increases but the intensity decreases

5 / 10

Light travelling through air is incident on glass at an angle of 23°. The refractive index of the glass is 1.52. Calculate the angle of refraction.

0.3°

14.9°

23.0°

25.7°

6 / 10

The refractive index of glass is 1.52, what speed does light travel through it?

1.97x10⁸ ms^-1

2.97x10⁸ ms^-1

3x10⁸ ms^-1

4.56x10⁸ ms^-1

7 / 10

A stationary wave at the first harmonic is created on a 40 cm length of string with mass 1.2 kg. The full length of the string is 65 cm and is under tension of 3 N. Calculate the frequency.

0.125 Hz

0.196 Hz

1.25 Hz

1.96 Hz

8 / 10

What is the wavelength of the fifth harmonic of a stationary wave on a string of length 4m fixed at both ends?

0.67 m

0.8 m

1.25 m

1.6 m

9 / 10

Select the correct pair of conditions necessary for sources of waves to be coherent.

Same wavelength with a phase relationship a time period apart.

Same frequency with a phase relationship a time period apart.

Same wavelength with a constant phase relationship T/2 apart.

Same frequency with a constant phase relationship

10 / 10

Soumya plays a note of wavelength 25 cm on her synthesiser. She knows the speed of sound is 340 ms^-1 in air. Calculate the frequency.

13.6 Hz

85 Hz

1360 Hz

8.5 kHz

Your score is

Materials Random Retrieval

This quiz contains all the questions in the Materials section. The website will pick 10 questions at random.

1 / 10

When undertaking practical work to measure the viscosity of liquid, why should the marker the signifies timer start be approximately halfway down the tube?

To reduce the percentage error.

To reduce the human error.

To allow the ball bearing to reach terminal velocity.

All of the above.

2 / 10

A steel ball bearing is dropped into a fluid and travels 60 cm in 2.53 s. The diameter of the ball bearing is 6 mm and its mass 15.3 g. Calculate the viscosity of the fluid. g=9.81 Nkg^-1

1.1 Pa s

5.6 Pa s

11.2 Pa s

56.0 Pa s

3 / 10

A 4.2 g balloon is inflated with 1.8 g of air until it is 1.4x10^-3 m³ in volume. Calculate the density of the inflated balloon.

1.3 kgm^-3

3.0 kgm^-3

4.3 kgm^-3

8.4 kgm^-3

4 / 10

Two wires, Q and W, are connected in series and a force, F is applied. Q and W have the same length, l the same diameter, d but are made from different materials. Therefore, the Young's Modulus of Q, E, is twice the value of W. Which expression is correct for the total extension in the system?

5 / 10

The graph above shows a wire being extended by adding masses. Estimate from the graph the Young's modulus.

0.67 Jm^-3

1.50 Jm^-3

192 Jm^-3

384 Jm^-3

6 / 10

A material has a stress of 6x10⁸ Nm^-2 and is placed under a 5% strain. Calculate the value for the materials Young's modulus.

1.2x10⁸ Nm^-2

3x10⁹ Nm^-2

1.2x10¹⁰ Nm^-2

3x10¹¹ Nm^-2

7 / 10

A stress-strain graph is shown above for an unknown material. Where on the curve would you mark the UTS point?

8 / 10

This graph shows the extension of 4 different springs, which spring is the stiffest?

9 / 10

A meteor traveling through space has a k = 4.2x10⁶ Nm^-1 and a force of 5x10⁸ N. Calculate the extension of the meteor.

8.4x10^-3 m

8.4 m

11.9 m

119.0 m

10 / 10

A spring extends by 12 cm when a mass of 87 g is attached to it. Calculate the spring constant. g = 9.81 ms^-2

0.01 Nm^-1

0.10 Nm^-1

1.02 Nm^-1

10.24 Nm^-1

Your score is

Electric Circuits Random Retrieval

This quiz contains all the questions in the Electric Circuits section. The website will pick 10 questions at random.

1 / 10

The unit of power is the watt. A correct alternative unit is:

VCs^-1

Ω²V^-2

V²Ω

V²Ω^-2

2 / 10

The unit of resistance is the ohm. A correct alternative unit is:

WA²

WA^-1

WA^-2

3 / 10

Select a use for this circuit when the temperature fluctuates. Assume V_out is the location of external circuitry

A fan to switch on in warm temperatures.

Street lights to switch on in darkness.

Operate a heater in a reptile house.

A speaker that operates upon sunrise.

4 / 10

A 75 watt light bulb is left ON for 24 hours, calculate the total energy transferred.

1800 J

1.08 x10⁵ J

6.48x10⁶ J

3.89x10⁸ J

5 / 10

A light bulb of resistance 600 Ω is powered by a 230 V supply. Calculate the power rating of the bulb.

0.4 W

2.6 W

88.2 W

600.0 W

6 / 10

Which graph best represents the resistance of an NTC thermistor?

7 / 10

Which graph best represents the I-V characteristic graph of a diode?

8 / 10

Which of these circuit symbols represents a thermistor?

9 / 10

What would be the n value of a perfect insulator?

Very small

10 / 10

Calculate the charge of 2.7 A current flowing for 3 minutes.

8.10 C

66.7 C

143 C

486 C

Your score is

Mechanics Random Retrieval

This quiz contains all the questions in the Mechanics section. The website will pick 10 questions at random.

1 / 10

If an object is on its pivot, what can be said about the moments?

The total clockwise moment about the pivot is greater than the total anticlockwise moment about the pivot.

The total clockwise moment about the pivot is less than the total anticlockwise moment about the pivot.

The total clockwise moment about the pivot is equal to the total anticlockwise moment about the pivot.

The total clockwise moment about the pivot is twice as large as the total anticlockwise moment about the pivot.

2 / 10

Sheffield is famous for its snooker. A 170 g white ball is struck with a cue and travels along the snooker table at 12 ms^-1. Calculate it's momentum.

2.04 kg ms^-1

204 kg ms^-1

2040 kg ms^-1

3 / 10

Why do objects (in a medium) not achieve terminal velocity instantly?

The upward force is larger than the downward force so there is a resultant force upward.

The opposing force needs time to build up and oppose.

The acting forces need time to balance.

The downward force is larger than the upward force so there is a resultant force downward.

4 / 10

Complete the sentence: "Acceleration is always __________ the resultant force."

in the opposite direction as

perpendicular to

in the same direction as

irrelevant to

5 / 10

Four teachers are fighting over the last pack of board pens as shown in the diagram. Calculate the overall resultant force.

62.46 N

62.48 N

104.44 N

106.72 N

6 / 10

The complete Harry Potter collection in paperback has a mass of 3.4 kg. The book collection is placed on a sloping table at angle θ and is at rest. The maximum frictional force between the tabletop and the book collection is 17.7 N.

Calculate the minimum angle at which the book collection will slip. g = 9.81 Nkg^-2.

31°

48°

57°

59°

7 / 10

A student moves a table in class by pushing it at an angle of 11° with a force of 200 N. Calculate the vertical component.

38.1 N

38.2 N

196.3 N

196.4 N

8 / 10

These graphs show the acceleration of 4 Y9 100 m sprinters. Select the graph which shows student with the greatest acceleration.

9 / 10

A sandwich falls from an Air Traffic Control (ATC) tower of height 102 m. How long will it take to hit the ground?

3.22 s

4.56 s

10.39 s

20.79 s

10 / 10

Select if the following is a scalar or a vector: length

Scalar

Vector

Your score is

Working as a Physicist Random Retrieval

This quiz contains all the questions in the Working as a Physicist section. The website will pick 10 questions at random.

1 / 10

How many significant figures are in 103000?

2 / 10

What is 4.9999 to 3 decimal places.

4.9900

4.9990

4.999

5.000

3 / 10

Which is the SI unit for mass?

gram

kilogram

metric tonne

4 / 10

Which is the SI unit for time?

hour

parsec

second

5 / 10

What multiple of unit does giga (G) have?

1 x 10⁶

1 x 10⁹

1 x 10 ¹²

6 / 10

What multiple of unit does tera (T) have?

1 x 10⁹

1 x 10¹²

1 x 10 ¹⁵

7 / 10

What is 100 MW in gigawatts?

10 GW

1 GW

0.1 GW

8 / 10

A student places an item onto a balance in order to obtain its mass. They record the mass as 12.54 g. What’s is their absolute uncertainty for the mass reading?

± 0.01 g

± 0.02 g

± 0.1 g

± 0.125 g

9 / 10

A group of students time a ball bearing dropping through a tube of glycerol. They record the following times, in seconds: 9.2, 9.0, 8.9, 8.9 and 9.5. What is the uncertainty?

± 0.1 s

± 0.2 s

± 0.3 s

± 0.6 s

10 / 10

The radius of a cheesecake in the staff room is 7.5 ±0.5 cm, what is the percentage uncertainty for the area of the cheesecake?

3.34%

6.67%

13.34%

44.49%

Your score is

U11.1 – The 4 Types of Nuclear Radiation

The Four Types of Nuclear Radiation

1 / 15

Select the correct symbol for Alpha radiation.

2 / 15

Which material is sufficient to stop Beta-minus radiation?

A few cm of air

Paper

A few mm of aluminium

A vacuum

3 / 15

What is not a source of background radiation?

Cosmic radiation

WiFi devices

Rocks

Medical devices

4 / 15

What is a Beta-plus particle?

Positron

Electron

Helium Nucleus

Photon

5 / 15

What is not a cause of instability in the nucleus?

Too few neutrons

Too few nucleons

Too much energy

Too many neutrons

6 / 15

Which of the following is the least ionising?

Alpha

Beta-minus

Beta-plus

Gamma

7 / 15

Select the most appropriate word to complete the sentence: "Radioactive Decay is ____________."

Dangerous

Random

Endothermic

Exothermic

8 / 15

What is the relative charge of an Alpha particle?

9 / 15

What is the range of a Beta-plus particle?

Negligible

The same as Beta-minus

The opposite of Beta-minus

Infinite

10 / 15

What is the relative charge of a Beta-minus particle?

11 / 15

What is the charge of an Alpha particle?

1.6x10^-19

3.2x10^-19

6.4x10^-19

12 / 15

Which of the following is the most penetrating?

Alpha

Beta-minus

Beta-plus

Gamma

13 / 15

What is the fastest moving type of radiation?

Alpha

Beta-minus

Beta-plus

Gamma

14 / 15

What is the charge of an Beta-plus particle?

Negligible

1.6x10^-19 C

-1.6x10^-19 C

15 / 15

Select the correct statement.

The more ionisations, the further the radiation will travel.

The more ionisations, the faster the radiation will travel.

The less ionisations, the faster the radiation will travel.

The less ionisations, the further the radiation will travel.

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Nuclear Radiation

U10.3 – The Doppler Effect

The Doppler Effect

1 / 10

When a light source moves away from an observer, the wavelength becomes ____________.

Shorter

Longer

Stays the same

2 / 10

Which stationary observer will hear a higher pitched sound?

3 / 10

When a light source moves away from an observer, the light undergoes __________.

blueshift

redshift

whiteshift

blackshift

4 / 10

Select the best definition for the Big Bang Theory.

The universe exploded into existence from a single point.

An American TV sitcom centred around scientists.

All matter was originally compacted into a ball with infinite density and intense heat and began expanding.

All matter was originally compacted into a ball with infinite density and intense heat. The matter began expanding and continues to do so to this day,

5 / 10

Andromeda has a redshift of -0.001001, what is it's movement in relation to Earth?

Away from Earth

Towards Earth

Stationary

Can't tell

6 / 10

A galaxy has redshift of 0.19. Estimate the speed it is moving relative to Earth. H₀ = 75 kms^-1MPc^-1. 1 year ≈ 3.16x10⁷s, 1 pc ≈ 3.09x10¹⁶ m, c = 3x10⁸ ms^-1

5.70x10⁷ ms^-1

1.59x10⁹ ms^-1

7.83x10¹⁶ ms^-1

2.35x10²⁵ ms^-1

7 / 10

A galaxy has redshift of -0.32. Estimate the speed it is moving relative to Earth. H₀ = 75 kms^-1MPc^-1. 1 year ≈ 3.16x10⁷s, 1 pc ≈ 3.09x10¹⁶ m, c = 3x10⁸ ms^-1

9.37x10⁶ ms^-1

9.60x10⁷ ms^-1

1.32x10¹⁷ ms^-1

3.96x10²⁵ ms^-1

8 / 10

On this graph, which line represents the density of the universe is less than the critical density?

9 / 10

A galaxy has redshift of 0.48. Estimate the distance it is from Earth in light years. H₀ = 75 kms^-1MPc^-1. 1 year ≈ 3.16x10⁷s, 1 pc ≈ 3.09x10¹⁶ m, c = 3x10⁸ ms^-1

1.44x10⁸ ly

5.49x10⁹ ly

5.93x10²⁵ ly

6.25x10²⁵ ly

10 / 10

Estimate the diameter of the observable universe. H₀ = 75 kms^-1MPc^-1. 1 year ≈ 3.16x10⁷s, 1 pc ≈ 3.09x10¹⁶ m, c = 3x10⁸ ms^-1

1.3x10⁹ ly

2.6x10⁹ ly

1.3x10¹⁰ ly

2.6x10¹⁰ ly

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