A black body emitting all the radiation in the visible region appears________.
Correct answer: B. White
- A. Green
- B. White
- C. Blue
- D. Black
Explanation
If a black body emits all visible colours with suitable intensities, their additive combination is perceived as white light. Black means that little or no visible light reaches the eye, so students may choose black by focusing only on the phrase black body rather than on the emitted radiation.
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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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