Question

The plots of intensity versus wavelength for three black bodies at temperatures $T_{1},\,T_{2}$ and $T_{3}$ respectively are as shown. Their temperature are such that

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

Answer 1

Answer: (B)

According to Wien's law $\lambda_{m} \propto \frac{1}{T}$ and from the figure $(\lambda m)_{1}<(\lambda m)_{3}<(\lambda m)_{2}$ therefore $T_{1}>T_{3}>T_{2}$