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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
b
0.69
c
1.21
d
0.83

detailed solution

Correct option is B

λmT=b⇒TsunTNorth star=350510=3551=0.69

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