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

Photons are an example of light as a __________.

Wave

Particle

2 / 10

The wavelength of the electrons can be measured by diffraction. An electron gun accelerates electrons into a beam, these were diffracted and upon diffraction the wavelength was found to be 1.23×10^-9m. Calculate the potential difference used to accelerate the electrons from rest into a beam.

1.59x10^-19 V

3.89x10^-5 V

0.997 V

5.91x10⁵ V

3 / 10

In the context of electrons in atoms, what is excitation?

Enough energy is absorbed by an electron causing it to move to a higher energy level.

Enough energy is absorbed by an electron causing it to break free of the atom.

Enough energy is absorbed by an atom causing it to release all its electrons.

Enough energy is absorbed by an atom causing all its electrons to move up an energy level.

4 / 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

5 / 10

An object is 30 mm from a convex lens with focal length 8 cm. Is the image virtual or real?

Real

Virtual

6 / 10

Which lens causes light to diverge?

Convex

Concave

7 / 10

Calculate the critical angle for the boundary when light leaves a medium of refractive index 1.52 and enters air.

0.01°

0.65°

41.1°

65.7°

8 / 10

The speed of light in the core of a fibre optic cable is 2.04x10⁸ ms^-1. Calculate the refractive index.

0.68

1

1.27

1.47

9 / 10

The wavelength of a standing wave on a string fixed at both ends is 35 cm at the sixth harmonic, what is the full length of the string?

0.7m

1.05 m

2.1 m

2.45 m

10 / 10

Calculate the speed of a wave with a time period of 1x10^-3 s and a wavelength of 250 cm.

400 ms^-1

2500 ms^-1

4000 ms^-1

2.5x10⁵ ms^-1

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