InterviewSolution
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InterviewSolution
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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 cellA. Are one quarter as numerousB. Are half as numerousC. Each carry one quarter of their previous momentumD. Each carry one quarter of their previous energy |
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Answer» Correct Answer - A Number of photo electrons `(N) prop Intensity prop (1)/(d^(2)) rArr (N_(1))/(N_(2)) = ((d_(2))/(d_(1)))^(2)` `rArr (N_(1))/(N_(2)) = ((100)/(50))^(2) = (4)/(1) rArr N_(2) = (N_(1))/(4)`. |
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