The work function of the nickel is 5eV. When a light of wavelength 2000 A falls on it, it emits photo electrons in the circuit. Then the potential difference necessary to stop the fastest electrons emitted is (given h=6.67×10−34J−s)
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get the kinetic energy of photoelectrons in eV from photoelectric equation and it's magnitude is the required stopping potential for the fastest photoelectrons.
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