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1.sun rays r focused on a photosensitive plate with the help of convex lens.the photoelectric current is found to be i.if lens is replaced by another similar lens of half diameter nd double focal length then it will be 2.a 100 ev electron collides with a stationery helium ion he + in its ground state and excites into higher energy level.after collission he+ ions emit 2 photons in succession with a wavelength 1085A nd 304A.quauntum no of excited state


1.sun rays r focused on a photosensitive plate with the help of convex lens.the photoelectric current is found to be i.if lens is replaced by another similar lens of half diameter nd double focal length then it will be

2.a 100 ev electron collides with a stationery helium ion he+ in its ground state and excites into higher energy level.after collission he+ ions emit 2 photons in succession with a wavelength 1085A nd 304A.quauntum no of excited state



Grade:11

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