A black body has the property to _____________ all the radiation entering it.
Correct answer: C. Absorb
- A. Exude
- B. Reflect
- C. Absorb
- D. None of these
Explanation
A black body is an ideal absorber that absorbs all incident electromagnetic radiation, regardless of wavelength or direction. Reflecting radiation would make the object non-black-body-like, so students may select reflect by confusing a black surface with an ordinary dark surface.
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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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