The power radiated by a black body is P and it radiates maximum energy at wavelength, 0 . If the temperature of the black body is now changed so that it radiates maximum energy at wavelength 3 4 0 , the power radiated by it becomes nP. The value of n is

1. A. 256 81
2. B. 4 3
3. C. 3 4
4. D. 81 256

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