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 is 5V. The incident radiation lies in-
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Question

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 is 5V. The incident radiation lies in-

G1 Physics · Accepted Answer

Step 1: Use Einstein's equation Kₘₐₓ = h(ν−ν₀) = eVₛ. Step 2: The threshold frequency ν₀ fixes the work function φ = hν₀. Step 3: Substitute the frequencies given in the question and solve for Kₘₐₓ or Vₛ. Final: A: ultra-violet region.