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To what effective potential a proton bea...

To what effective potential a proton beam be subjected to give its protons a wavelength of `1xx10^(-10)m`?

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The correct Answer is:
`0.0826 `volts
`V=((h)/(lambda))_(2)^(2)(1)/(mp.e)`
`=8.26xx10^(-2) V`
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