U9.5 – Black Body Radiators

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Black Body Radiators

1 / 10

Complete the sentence: "A black body radiator is..."

2 / 10

Which wavelengths of electromagnetic radiation can a black body radiator absorb?

3 / 10

Which wavelengths of electromagnetic radiation can a black body radiator emit?

4 / 10

What happens to the temperature of a body that absorbs IR faster than it emits?

5 / 10

Calculate the temperature of a black body radiator that has a peak wavelength of 106 nm.

6 / 10

Calculate the frequency of a black body radiator that has a temperature of 4.2x104 K.

7 / 10

Calculate λmax for a black body radiator at a temperature of 2300 K.

8 / 10

On the diagram shown, select the curve that represents the black body with the highest temperature.

9 / 10

Blinkend Bladus is a completely made up star. However, it has a surface area of 1.45x1017 m2 and produces a black body spectrum with peak wavelength of 280 nm. Calculate the luminosity of Blinkend Bladus.

10 / 10

Regulus is the brightest star in the Leo constellation. It has a surface temperature of 12460 K and a luminosity of 288 L. Calculate its radius. 1 L (solar luminosity) = 3.828×1026 W

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