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calculate the wavelength of an electron ...

calculate the wavelength of an electron moving with a velcoity of `2.05 xx 10^(7)m s^(-1)`. ]

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de Broglie relation
`lambda=h/(m u)=(6.6xx10^(-34) kg m^(2) s^(-1))/(9.1xx10^(-31) kgxx2.05xx10^(7) m s^(-1))`
`=2.91xx10^(-11) m`
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