The range of wavelength of radiations emitted by a hot body at different temperature is
Correct answer: B. discrete
- A. infinite
- B. discrete
- C. continuous
- D. discontinuous
Explanation
The correct answer is 'discrete.' When a hot body emits radiations, the wavelengths are specific and distinct for each temperature, resulting in a discrete range. The other options are incorrect because the range is not infinite, continuous, or discontinuous; it is discrete and specific to each temperature.
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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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