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Though what potential difference must an...

Though what potential difference must an electron pass to have a wavelength of 500Å.

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`lambda=(h)/(mv)=(h)/sqrt(2m.e.V)`
`V=(h/lambda)^(2)1/(2me)`=`(6.63xx10^(-34))^2/((5xx10^(-18))^(2)xx2xx9.01xx10^(-31)xx1.6xx10^(-19)`
`6.03xx10^(-4)`
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