Question

which one of the following is ${\nu }_M-T$ graph for perfectly black body? ${\nu }_m$ is the frequency of radiation with maximum intensity. T is the absolute temperature.

• A. A
• B. B
• C. C
• D. D

Answer 1

Answer: (C)

C

According to Wien's displacement law
${\lambda }_{m}T=b$ where b is the Wien's constant.

In terms of frequency, $\frac{c}{{\nu }_m}T=b$ or ${\nu }_m=\frac{c}{b}T$

So ${\nu }_m$$\propto$ $T$

Hence, the ${\nu }_m-T$ graph is a straight line.