All of the following are the characteristics of an ideal black body EXCEPT that
Correct answer: D. It reflects incident radiation of all wavelengths.
- A. It is the most efficient radiator.
- B. It is a perfect absorber of radiation.
- C. Its absorption power is equal to one.
- D. It reflects incident radiation of all wavelengths.
Explanation
An ideal black body is characterized by its ability to absorb all incident radiation, with an absorption power equal to one, and it is also the most efficient radiator. However, it does not reflect any incident radiation. Therefore, the correct answer is Option D: 'it reflects incident radiation of all wavelengths,' as this statement is not true for an ideal black body. Options A, B, and C correctly describe the properties of an ideal black body.
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Quantum theory treats electromagnetic radiation as packets of energy called photons, with energy proportional to frequency through E equals hf. The topic covers Planck's hypothesis, photon momentum, the photoelectric effect, threshold frequency, work function and wave particle duality, distinguishing quantised energy exchange from classical continuous radiation.
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