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Q.

The power radiated by a black body is P and it radiates maximum energy around the wavelength λo- Now the temperature of the black body is changed so that it radiatesmaximum energy around wavelength λ0/2. The power radiated by it will now increase by a factor of:

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a

2

b

16

c

8

d

64

answer is B.

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Detailed Solution

T'=λ0λ02T=2T⇒Power radiated will increase by a factor of 24=16.
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