Dual Nature of Matter

JEE Main level, single correct, medium

194 of 200

Question 194 of 200

The threshold frequency for a metallic surface corresponds to an energy of 6.2eV6.2 \mathrm{eV}, and the stopping potential for a radiation incident on this surface 5 V5 \mathrm{~V}. The incident radiation lies in

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Answer: (B) ultra-violet region

λ=1242eV nm11.2≈1100A˚\lambda=\frac{1242 \mathrm{e} V \mathrm{~nm}}{11.2} \approx 1100 Å
Ultraviolet region

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