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Q.

A black body radiates power P and maximum energy is radiated by it around a wavelength λ0. The temperature of the black body is now changed such that it radiates maximum energy around the wavelength 3λ04.The power radiated by it now is

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a

25681P

b

169P

c

6427P

d

43P

answer is A.

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Detailed Solution

λmT= constant ⇒T=43T0Since, P∝T4(from Stefan’s Law)⇒Pnew =25681P
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