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Temperatures of two stars are in ratio 3:2. If wavelength of maximum intensity of first body is 4000 Å, what is corresponding wavelength of second body?

(a) 9000 Å

(b) 6000 Å

(c) 2000 Å

(d) 8000 Å

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The correct choice is (b) 6000 Å

Explanation: ((ʎm)^‘)/ʎm = T/T^‘ = 3/2

(ʎm)^‘=3/2 ʎm

(ʎm)^‘=3/2×4000=6000Å.

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