Q.

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 . The Wien’s constant b = 2.80 x 106nm 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

For any temperature the energy is maximum in the middle range of wavelength. So, the energy is maximum for wavelength 1000 nm.
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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 . The Wien’s constant b = 2.80 x 106nm K. Then