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.
19. Based on the figure, at a temperature of 300 K and a wavelength of 30 × 10-6 m, the brightness of a black-body will most likely be:
Your Answer is
Correct Answer is A
Explanation
Looking at the picture, judging from the trend of the 300 K curve, when the abscissa wavelength is 30×10-6 m, the ordinate should be close to 0, so option A is the closest