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The de-Broglie wavelength of an electron...

The de-Broglie wavelength of an electron of kinetic energy 9 eV is (take, `h=4xx10^(-15)eV-s,c=3xx10^(10)cm//s` and the mass `m_(e)` of electron as `m_(e)c^(2)=0.5` MeV 

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