JEE Physics Practice Question

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 $\frac{h c}{e}=1.24 \times 10^{-6} \mathrm{~V}-\mathrm{m}$ ] List-I (P) $2000 \mathrm{~K}$ (Q) $3000 \mathrm{~K}$ (R) $5000 \mathrm{~K}$ (S) $10000 \mathrm{~K}$ 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.

1. A.$P \rightarrow 3, Q \rightarrow 5, R \rightarrow 2, S \rightarrow 3$
2. B.$P \rightarrow 3, Q \rightarrow 2, R \rightarrow 4, S \rightarrow 1$
3. C.$P \rightarrow 3, Q \rightarrow 4, R \rightarrow 2, S \rightarrow 1$
4. D.$P \rightarrow 1, Q \rightarrow 2, R \rightarrow 5, S \rightarrow 3$