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Dual Nature of Radiation and Matter

Multiple Choice Questions

61.

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

are half as numerous
are one quarter as numerous
each carry one quarter of their previous energy
each carry one quarter of their