A caesium photocell , with a steady pote...

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

each caryy one quarter of their previous energy

each carry one quarter of their previous momentum

are half as numerous

are one quarter as numerous

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