Modern Physics — Medium JEE physics MCQ
Match the temperature of a black body given in List-I with an appropriate statement in List-II, and choose the correct option.
[Given: Wien's constant as $2.9 \times 10^{-3} \mathrm{~m}-\mathrm{K}$ and $\frac{h c}{e}=1.24 \times 10^{-6} \mathrm{~V}-\mathrm{m}$ ]
\textbf{List-I}
(P) $2000 \mathrm{~K}$
(Q) $3000 \mathrm{~K}$
(R) $5000 \mathrm{~K}$
(S) $10000 \mathrm{~K}$
\textbf{List-II}
(1) The radiation at peak wavelength can lead to emission of photoelectrons from a metal of work function $4 \mathrm{eV}$.
(2) The radiation at peak wavelength is visible to human eye.
(3) The radiation at peak emission wavelength will result in the widest central maximum of a single slit diffraction.
(4) The power emitted per unit area is $1 / 16$ of that emitted by a blackbody at temperature $6000 \mathrm{~K}$.
(5) The radiation at peak emission wavelength can be used to image human bones.
- A. $P \rightarrow 3, Q \rightarrow 5, R \rightarrow 2, S \rightarrow 3$
- B. $P \rightarrow 3, Q \rightarrow 2, R \rightarrow 4, S \rightarrow 1$
- C. $P \rightarrow 3, Q \rightarrow 4, R \rightarrow 2, S \rightarrow 1$
- D. $P \rightarrow 1, Q \rightarrow 2, R \rightarrow 5, S \rightarrow 3$
Solution
The correct option is **C**.