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    Light with photons of energy $8.0 \times 10^{-20}$ J are incident on a metal surface in a photoelectric experiment.

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    HLPaper 1A

    Light with photons of energy 8.0×10−208.0 \times 10^{-20}8.0×10−20 J are incident on a metal surface in a photoelectric experiment.

    The work function of the metal surface is 4.8×10−204.8 \times 10^{-20}4.8×10−20 J. What minimum voltage is required for the ammeter reading to fall to zero?

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