A certain metal when irradiated by light ( u = 3.2 × 10 16 Hz) emits photoelectrons with…

Physics · Class 11 · CBSE — Photoelectric Effect And Wave-Particle Duality

A certain metal when irradiated by light (u = 3.2 × 1016 Hz) emits photoelectrons with twice K.E. as did photoelectrons when the same metal is irradiated by light (u = 2.0 × 1016 Hz). The u0 of the metal is
  1. 1.2 × 1014 Hz
  2. 8 × 1015 Hz
  3. 1.2 × 1016 Hz
  4. 4 × 1012 Hz.

Answer

(B) 8 × 10 15 Hz

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