A body at temperature T radiates heat according to relation:
Correct answer: B. T4
- A. T-2
- B. T4
- C. T-4
- D. None of these
Explanation
By the Stefan-Boltzmann Law, for a black body, the amount of heat radiated per unit area is directly proportional to the fourth power of the kelvin temperature. The proportionality constant is called Stefen's constant and has a value of 5.67x10(-8).
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Classical physics cannot explain blackbody radiation and related observations, leading to Planck’s quantum theory, in which energy is emitted or absorbed in discrete packets. Photons provide the particle model of light, with energy and momentum linked to frequency and wavelength, including the photoelectric effect and its threshold frequency.
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