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Calculate the wavelength of an electron ...

Calculate the wavelength of an electron moving with a velocity fo ` 2. 05 xx 10^7 ms^(-1)`.

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By de Broglie equation
`lambda=h/(mv)=(6.626xx10^(-34) Js)/((9.11xx10^(-31) kg)(2.05xx10^(7) ms^(-1)))=3.55xx10^(-11)m (1 J=1 kg m^(2) s^(-2))`
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