A perfect absorber must also be perfect:
Correct answer: B. Radiator
- A. Cavity
- B. Radiator
- C. Source of radiation
- D. None of them
Explanation
A perfect absorber must also be a perfect radiator according to the principle of reciprocity. This means that an object that absorbs all incident radiation perfectly will also emit radiation at the same frequency with maximum efficiency.
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About Quantum Theory and Radiation
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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