Wavelength of an electron is `5Å` Velocity of the electron is 

Options

A. `1.45xx10^8 ` cm/s
B. `1.6 xx 10^(-8)` cm/s
C. `3.2xx10^(-27)` cm/s
D. `3.2xx10^(27)`cm/s

Answer

A

Explanation

`v = h/(mlambda)`
`=(6.6xx10^(-34))/(9xx10^(-31) xx 5 xx 10^(-10)) = 1.45 xx 10^8` cm/sec