NEET 2018 Physics Black Body Radiation MCQ Question
The power radiated by a black body is P and it radiates maximum energy at wavelength λ₀. If the temperature of the black body is now changed so that it radiates maximum energy at wavelength 3/4 λ₀, the power radiated by it becomes nP. The value of n is
3/4
4/3
256/81
81/256
Correct Answer
Detailed Explanation
According to Stefan-Boltzmann law, the power radiated is proportional to the fourth power of temperature. Using Wien's displacement law, the temperature is inversely proportional to the wavelength of maximum emission.
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