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Question

The intensity of radiation emitted by the sun has its maximum value at a wavelength of $$510$$ nm and that emitted by the North star has the maximum value at $$350$$ nm. If these stars behave like black bodies, then the ratio of the surface temperatures of the sun and the north star is:


A
1.46
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B
0.69
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C
1.21
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D
0.83
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Solution

The correct option is B 0.69
Using Wien,s displacement law, $$\lambda_m T=$$ constant, we get here
$$\dfrac{T_S}{T_N}=\dfrac{\lambda_m(N)}{\lambda_m(S)}=\dfrac{350}{510}=0.69$$


Physics

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