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Question

A black body is at a temperature of 5760K. The energy of radiation emitted by the body at wavelength 250nm is U1, at wavelength 500nm is U2 and that at 1000nm is U3. Wien's constant, b=2.88×106nmK. Which of the following is correct?

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 D U2>U1
Maximum amount of emitted radiation corresponding to λm=bT

λm=2.88×106nmK5760K=500 nm

From the graph we can see that U1<U2>U3

514146_477363_ans_d294fe010a1c4abead2105cf6fbf6525.png

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