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

Options

A. `7.25 xx 10^(6) m//s`
B. `6.26 xx 10^(6) m//s`
C. `5.25 xx 10^(6) m//s`
D. `4.24 xx 10^(6) m//s`

Answer

A

Explanation

By using `lambda_(el ectron) = (h)/( m_(e) v) rArr v = (h)/( m_(e) lambda_(e))`
` = (6.6 xx 10^(-34))/(9.1 xx 10^(-31) xx 10^(-10)) = 7.25 xx 10^(6) m//s`.