If the temperature of the black body becomes double, the intensity of radiation from it will become
Correct answer: B. Four times
- A. Double
- B. Four times
- C. Six times
- D. Sixteen times
Explanation
According to Stefan-Boltzmann law, the intensity of radiation from a black body is directly proportional to the fourth power of its absolute temperature (in Kelvin). Therefore, if the temperature doubles, the intensity of radiation will increase by a factor of \(2^4 = 16\).
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About Dawn of Modern Physics
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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