A black body is considered ideal when it:
Correct answer: C. Both A and B
- A. Emits all radiation
- B. Absorbs all radiation
- C. Both A and B
- D. None of these
Explanation
A blackbody is defined as an ideal body that allows all incident radiation to pass into it (zero reflectance) and that absorbs internally all the incident radiation (zero transmittance).
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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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