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ii) A photosensitive metallic surface has work function hfe. If the photons of energy hfo fall on this surface, the electrons come out with

ii) A photosensitive metallic surface has work function hfe. If the photons of energy hfo fall on this surface, the electrons come out with a maximum velocity 4x10 ms!. When the photon energy is increased to 5 hfo then find the maximum velocity.

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