question_answer

Direction for: In each of the following questions a statement of Assertion is given followed by a corresponding statement of Reason just below it. Of the statements mark the correct answer as

Assertion For higher temperature, the peak emission wavelength of a black body shifts to lower wavelength. Reason Peak emission wavelength of a black body is proportional to the fourth power of temperature.

A)  If the Assertion and Reason are true and Reason is the correct explanation of Assertion.

B)  If both Assertion and Reason are true but Reason is not the correct explanation of Assertion.

C)  If Assertion is true but Reason is false.

D)  If both Assertion and Reason are false.

Correct Answer: C

Solution :

 According to Wiens law \[{{\lambda}_{m}}T=\text{constant}\]i.e., peak emission wavelength \[{{\lambda }_{m}}\propto \frac{1}{T}.\]Also as increases \[{{\lambda }_{m}}\] decreases.