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An electron having energy 20 e V collide...

An electron having energy `20 e V` collides with a hydrogen atom in the ground state. As a result of the colllision , the atom is excite to a higher energy state and the electron is scattered with reduced velocity. The atom subsequentily returns to its ground state with emission of rediation of wavelength `1.216 xx 10^(-7) m`. Find the velocity of the scattered electron.

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The correct Answer is:
`6`
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