When 200nm light is incident on the cathode of a, Physics

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When 200nm light is incident on the cathode of a

When 200nm light is incident on the cathode of a photoelectric tube, the stopping potential is 4.2V. A) Find the velocity of the most energetic electron emitted from the cathode when the incident light on the cathode is 100nm. B) Find the cutoff wavelength for the photoelectric tube.

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