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With what velocity must an electron trav...

With what velocity must an electron travel so that its momentum is equal to that of a photon with a wavelength of `5000overset(0)A` `(h=6.6xx10^(-34)Js,m_(e)=9.1xx10^(-31) Kg)`

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The correct Answer is:
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`mv=(h)/(lambda)rArrv=(6.6xx10^(-34))/(9.1xx10^(-31)xx5000xx10^(-10))=1450m//s`
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