Question

The plots of intensity of radiation versus wavelength of three black bodies at temperatures $T_{1}, T_{2}$ and $T_{3}$ are shown. Then,

• A. $T_{3}>T_{2}>T_{1}$
• B. $T_{1}>T_{2}>T_{3}$
• C. $T_{2}>T_{3}>T_{1}$
• D. $T_{1}>T_{3}>T_{2}$

Answer 1

Answer: (D)

According to Wien's law if $\lambda$ is the wavelength at maximum intensity
$\lambda T=$ constant.
$\therefore $ Shorter the wavelength of the peak, greater the temperature for intensity vs $\lambda$ graph.
$\left(\lambda_{\max }\right.$, is not maximum wavelength but $\lambda$ at maximum intensity)
$T_{1} >T_{3} >T_{2} $