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For photoelectric emission from a metal, which statements are correct when the light frequency is above the threshold frequency?

  1. AThe maximum kinetic energy of the electrons does not depend on the intensity of light
  2. BThe maximum kinetic energy increases linearly with the frequency of light
  3. CThe emission starts only after a time lag if the intensity is very low
  4. DThe saturation current is proportional to the intensity at fixed frequency

Answer: A, B, D

= h nu - W depends only on frequency, linearly, and not on intensity. Saturation current is proportional to the number of photons per second, which is proportional to intensity at fixed frequency. Emission is instantaneous (no time lag) since each electron absorbs a single photon.
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