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Find the velocity of an electron so that...

Find the velocity of an electron so that its momentum is equal to that of a photon of wavelength 650 nm.

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`lamda=h/p` [from de Broglie equation]
`therefore` If momentum of electron=momentum of photon, then `lamda` of electron=`lamda` of photon=650 nm
Applying de Broglie equation to electron, `lamda=(h)/(p)=(h)/(mv)`
`therefore v=(h)/(mlamda)=(6.63xx10^(-34))/((9.11xx10^(-31))(650xx10^(-9)))`
`=1118.97m*s^(-1)`
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