A caesium photocell, with a steady potential difference of $60V$ across, is illuminated by a bright point source of light $50 cm$ away. When the same light is placed 1m away the photoelectrons emitted from the cell

  • A

    Are one quarter as numerous

  • B

    Are half as numerous

  • C

    Each carry one quarter of their previous momentum

  • D

    Each carry one quarter of their previous energy

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