As the temperature of black body is raised the wavelength corresponding to maximum intensity________________?
Correct answer: B. shifts towards shorter wavelength
- A. shifts towards longer wavelength
- B. shifts towards shorter wavelength
- C. remain the same
- D. shifts towards longer as well as shorter wavelengths
Explanation
Wien's displacement law states λmax T = constant, so increasing the black-body temperature makes the wavelength of maximum intensity smaller. The peak therefore shifts towards shorter wavelengths, often toward the blue or ultraviolet region. Students may choose a by thinking hotter objects emit longer waves, confusing total emitted energy with peak wavelength.
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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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