If the temperature of black body is raised, then the wavelength corresponding to maximumintensity will
Correct answer: D. shift towards shorter wavelength.
- A. become zero.
- B. remain the same.
- C. shift towards longer wavelength.
- D. shift towards shorter wavelength.
Explanation
When the temperature of a black body is raised, the wavelength corresponding to maximum intensity shifts towards a shorter wavelength. This is described by Wien's Displacement Law, which states that the peak wavelength (λmax) of emitted radiation from a black body is inversely proportional to its absolute temperature (T).The formula is:λmax * T = bwhere 'b' is Wien's displacement constant.This means if the temperature (T) increases, the peak wavelength (λmax) must decrease to keep the product constant. Conversely, if the temperature decreases, the peak wavelength increases.Therefore, for the given MCQ:D) shift towards shorter
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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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