Question No 8 Electrons are emitted from an electron gun at almost zero velocity and are accelerated by an electric field E

Question

Question No 8 Electrons are emitted from an electron gun at almost zero velocity and are accelerated by an electric field E through a distance of 1 0 m The electrons are now scattered by an atomic hydrogen sample in the ground state What should be the minimum value of E so that red light of wavelength 656 3 nm may be emitted by the hydrogen Options 3 4 Volt m 20 4 Volt m

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