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2 2 2 Photoelectrons are observed to just emit out of a material surface when...

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2 2 2 Photoelectrons are observed to just emit out of a material surface when the light of 620 nm falls on it with the intensity of 100 W m2 If the light of wavelength 400 nm is incident on the same material with an intensity of 1 W m2 what would be the minimum reverse potential needed to stop the outflow of the electrons 2 d 1 1 V 3 1 2 V 2 2 V 4 1 9 V

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