Question

On increasing the temperature of a body, the frequency $\left(f_{max}\right)$ corresponding to maximum emission of radiation will :

• A. increase
• B. decrease
• C. first decrease and then increase
• D. remain constant

Answer 1

Answer: (A)

increase

According to Wein's displacement law:
$\lambda T=b$
For any type of electromagnetic radiation:
$\lambda \nu =c$

$\lambda =\frac{c}{\nu }$
i.e.
$\frac{T}{\nu }=constant$
In other words, if the absolute temperature increases, the frequency which corresponds to maximum emission of radiation also increases.