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What must be the velocity of a beam of e...

What must be the velocity of a beam of electron if they are to display a de Broglie wavelength of `1 Å`

Text Solution

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`lamda = 1Å =1 xx 10^(-10)m`
`m=9.1 xx 10^(-31) kg, h = 6.63 xx 10^(-34) kg m^(2)//sec`
`lamda = (h)/(mv)`
`rArr v = (h)/(m lamda) = (6.63 xx 10^(-34))/(9.1 xx 10^(-31) xx 10^(-10)) = 7.29 xx 10^(6) m//s`
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