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MHT CET Physics question

PhysicsDual Nature of Matter and RadiationMHT CET

Silver has a work function of 4.7 eV. When ultraviolet light of wavelength 100 nm is incident on it, a potential of 7.7 V is required to stop the photoelectrons from reaching the collector plate. How much potential will be required to stop photoelectrons, when light of wavelength 200 nm is incident on it?

Answer: (D)

Solution

: for 100 nm, V; for 200 nm the photon energy halves to 6.2 eV, so

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Question ID VK-083648