When the temperature of a black body is raised, it emits radiations.With the increase in temperature, the wavelength associated with the maximum intensity
Correct answer: D. Shifts towards the shorter wavelength.
- A. Becomes zero.
- B. Remains the same.
- C. Shifts towards the longer wavelength.
- D. Shifts towards the shorter wavelength.
Explanation
The correct answer is Option D: shifts towards the shorter wavelength. This is explained by Wien's Displacement Law, which states that the peak wavelength of radiation emitted by a black body is inversely proportional to its temperature. Thus, as the temperature increases, the peak wavelength shifts towards shorter wavelengths. Option A is incorrect because a wavelength of zero is not possible. Option B is incorrect because the wavelength does change with temperature. Option C is incorrect because the wavelength shifts towards shorter wavelengths, not longer.
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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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