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[" 3.An electron of mass "m" with an ini...

[" 3.An electron of mass "m" with an initial "],[" velocity "vec v=v_(0)hat i(v_(0)>0)" enters an electric "],[" field "vec E=-vec E_(0)hat i(E_(0)=" constant ">0)" at "t=0],[" If "lambda_(0)" is its de-Broglie wavelength initially,"],[" then its de-Broglie wavelength at time "t" is "],[[" (a) "(lambda_(0))/((1+(eE_(0))/(mv_(0))t))," (d) "lambda_(0)" ."],[" (c) "lambda_(0)t," (d) "lambda_(0).]]

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