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Q.

A black body, at 200 K, is found to have maximum energy at a wave length of 14 μm. When its temperature is raised to 1000 K, the wavelength at which maximum energy is emitted is

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a

70 μm

b

14 μm

c

2.8 μm

d

2.8 mm

answer is C.

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Detailed Solution

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λm1T1=λm2T2

⇒200×14=1000×λm2

⇒λm2=2.8μm

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