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-- 4. Consider a monochromatic linear source of light which is placed at a distance of r from a very small metal plate. Due to photoelectric effect electrons are ejected at rate N per second and it is found that maximum kinetic energy of photoelectron is K. If source is brought closer to a distance r/3, the rate of emission and the maximum kinetic energy of photoelectron become nearly
A
N/3, 3K
B
3N, 3K
C
9N, K
D
3N, K/3
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