The maximum energy in thermal radiations from a blackbody occurs at wavelength 4000 Å. The effective temperature of the source is :

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7000 K

8000 K

104 K

108 K

answer is A.

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Detailed Solution

according to Wien's displacment law λmT = 2.8 x10-3mK T= 2.8 x 10-34 x10-7= 7000 K

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