The wavelength associated with an electron moving with a velocity of `10^10 cm per sec`.

Options

A. `0.0772 Å`
B. `772 Å`
C. `772 nm`
D. `0.772 nm`

Answer

A

Explanation

(a) Mass of the electron `= 9.10 xx 10^28 g`
Velocity of electron `= 10^10 cm per sec`
`h = 6.62 xx 10^-27 erg-sec`
According to de Broglie equation,
`lamda = (h)/(mv) = (6.62 xx 10^-27)/(9.10 xx 10^-28 xx 10^10)`
=`7.72 xx 10^-10 cm = 0.0772 Å`.