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Electron are emitted from an electron gu...

Electron are emitted from an electron gun at almost zero velocity and are accelerated by an electric field `E` through a distance of `1.0m` The electron are now scattered by an atomic hydrogen sample in ground state what should be the minimum value of `E` so that red light of wavelength `656.5 nm` may be emitted by the hydrogen?

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The correct Answer is:
`[12.1 "volts"//m]`
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