Absorption power of perfect black body is:
Correct answer: C. One
- A. Zero
- B. Infinite
- C. One
- D. 1/2
Explanation
The absorptive power of a body or a surface is defined as the ratio of the energy absorbed in a given time to the radiant energy incident on it at the same instant of time. The absorptive power of a black body is 1 because it absorbs radiant energy of all wavelengths incident on it.
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Classical physics cannot explain blackbody radiation and related observations, leading to Planck’s quantum theory, in which energy is emitted or absorbed in discrete packets. Photons provide the particle model of light, with energy and momentum linked to frequency and wavelength, including the photoelectric effect and its threshold frequency.
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