1.

The speed of an electron having a wavelength of 10^(-10) m is

Answer»

`7.25 XX 10^(6) ms^(-1)`
`6.26 xx 10^(6) ms^(-1)`
`5.25 xx 10^(6) ms^(-1)`
`4.24 xx 10^(6) ms^(-1)`

Solution :As `lambda = (H)/(mv)`
`therefore V = (h)/(m lambda) = (6.6 xx 10^(-34))/(9.1 xx 10^(-31) xx 10^(-10)) = 7.25 xx 10^(6) ms^(-1)`


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