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A beam of electrons is accelerated from ...

A beam of electrons is accelerated from rest by a potential difference V1 . The de-broglie wavelength of electrons is `lamda`. If the elctrons are further accelerated by voltage V2 , de-Broglie wavelength become `lamda`/3. Find the ratio V1/V2
1/3
1/3
1/4
1/8

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