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What is de Broglie wavelength of an elec...

What is de Broglie wavelength of an electron moving with `1/(20)`th of velocity of light ? Mass `= 9.1 xx 10^(-31)` kg.

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`v=(1/20)xxc=(1/20)xx3xx10^8 m//s`
`lambda=h/(mv)=(6.62xx10^-34xx20)/(9.1 xx10^-31xx3xx10^8)=4.85xx10^-11m`
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