Assertion : Blue star is at high temperature than red star.
Reason : Wein's displacement law states that `T prop (1//lambda_(m))`.

Options

A. If both assertion and reason are true and the reason is the correct explanation of the assertion.
B. If both assertion and reason are true but reason is not the correct explanation of the assertion.
C. If assertion is true but reason is false.
D. If the assertion and reason both are false.

Answer

A

Explanation

From Wien’s displacement law, temperature `(T) prop 1// lambda_m` (where `lambda_m` is the maximum wavelength). Thus temperature of a body is inversely proportional to the wavelength. Since blue star has smaller wavelength and red star has maximum wavelength, therefore blue star is at higher temperature than red star.