Question

Which one of the following is $v_{m}-T$ graph for perfectly black body? $v_{m}$ is the frequency of radiation with maximum intensity and $T$ is the absolute temperature.

• A. A
• B. B
• C. C
• D. D

Answer 1

Answer: (C)

According to Wien's displacement law
$\lambda_{m} T=b$
In terms of frequency, $\frac{c}{v_{m}} T=b$
or $v_{m}=\frac{c}{b} T$
Hence, the $v_{m}-T$ graph is a straight line as shown by curve $C$.