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Q.

Two stars A and B radiate maximum energy at the wavelength of 360 nm and 480 nm, respectively. Then, the ratio of the surface temperatures of A and B is

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a

3 : 4

b

81 : 256

c

4: 3

d

256: 81

answer is C.

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Detailed Solution

According to Wien's displacement law, λT= constant ∴ T1T2=λ2λ1=480360=43
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Two stars A and B radiate maximum energy at the wavelength of 360 nm and 480 nm, respectively. Then, the ratio of the surface temperatures of A and B is