The thermal radiations emitted by a body at low temperature is of
Correct answer: A. long wavelength.
- A. long wavelength.
- B. short wavelength.
- C. infinite wavelength.
- D. moderate wavelength.
Explanation
The correct answer is Option A:long wavelength.At lower temperatures, the thermal radiations emitted have longer wavelengths because the energy of the emitted photons is lower. Option B is incorrect because short wavelengths correspond to higher energy levels, which occur at higher temperatures. Option C is incorrect because infinite wavelengths are not physically possible. Option D is misleading; while moderate might seem reasonable, the reality is that lower temperatures emit longer wavelengths.
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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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