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Question

A black body is at a temperature of 2800 K. The energy of radiation emitted by this object with wavelength between 499 nm and 500 nm is U1, between 999 nm and 1000 nm is U2 and between 1499 nm and 1500 nm is U3. (Wiens constant b=2.80×106nmK). Then:

A
U1=0
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B
U3=0
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C
U1>U2
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D
U2>U1
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Solution

The correct option is B U2>U1
As we know that from the Wein's displacement law λmaxT=b and here three wavelength ranges are given, but for any temperature, energy will be maximum at middle of the wavelength.

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