As the temperature of the black body increases, the wavelength of maximum intensity radiation increases:
Correct answer: B. will shift towards the shorter wavelength
- A. will shift towards the longer wavelength
- B. will shift towards the shorter wavelength
- C. will not change
- D. None of these
Explanation
As the temperature of the blackbody increases, the peak wavelength decreases (Wien's Law). The intensity (or flux) at all wavelengths increases as the temperature of the blackbody increases.
This question appeared on the ETEA MDCAT 2006 paper, which you can sit online with every answer explained.
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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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