Passage IV

A blackbody is an object that absorbs all of the radiation that strikes it. The blackbody also emits radiation at all wavelengths; the emitted radiation is called blackbody radiation. The brightness of blackbody radiation at a given wavelength depends on the temperature of the blackbody. A graph of brightness versus wavelength for a blackbody is called a blackbody curve. Blackbody curves for the same blackbody at 3 different temperatures are shown in the figure below.

20. The radiation emitted by a star can be represented by the radiation from a blackbody having the same temperature as the star’s visible surface. Based on the figure, which of the following sets of blackbody curves best represents stars of equal diameter with surface temperatures of 3,000 K, 6,000 K, and 9,000 K ?

Answer and Explanation

Your Answer is

Correct Answer is J

Explanation

It can be seen from the figure in the text that the higher the temperature, the higher the corresponding curve. And the higher the temperature, the more the peak of the curve will be to the left, so choose J