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The threshold frequency for a metallic surface corresponds to an energy of 6.2 eV , and the stopping potential for a radiation incident on this surface 5 ~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

= 1242 e V ~nm 11.2 1100 Å Ultraviolet region

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