Q.

black body is at a temperature of 2880 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 isU2 and between 1499 nm and 1500 nm is U3. The Wien's constant b = 2.88 x 106 nm K. Then:

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a

U1 = 0

b

U3 = 0

c

U1 > U2

d

U2 > U1

answer is D.

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Detailed Solution

λmT=b⇒λm=bt=2.88×1062880=1000 nm.So, U2>U1and obviously U1≠0 and U2≠0.
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black body is at a temperature of 2880 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 isU2 and between 1499 nm and 1500 nm is U3. The Wien's constant b = 2.88 x 106 nm K. Then: