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JEE Main 2006
Exam
JEE Main
Year
2006
Subject
Physics
Chapter
Dual Nature of Matter

JEE Main 2006 · Physics · Dual Nature of Matter

The threshold frequency for a metallic surface corresponds to an...

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

Options

  1. AX-ray region
  2. Bultra-violet region
  3. Cinfra-red region
  4. Dvisible region

Correct answer

B. ultra-violet region

Step-by-step solution

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