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Question
Calculate the de-Broglie wavelength of an electron moving with one-fifth of the speed of light.Neglect relativistic effects. (`h = 6.63 xx 10^(-34)` J.s, c= `3xx10^8`m/s, mass of electron = `9 xx 10^(-31) kg)`
Solution
v = `1/5 xx 3 xx 10^8` m/s
`lambda = h/(mv)`
= `(6.63 xx 10^(-34))/(9xx10^(-31) xx 3/5 xx 10^8)`
= `1.22 xx 10^(-11)` m
= 0.122 Å
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