In an electron mircroscope, electrons are accelerated to great velocities. Calculate the wavelength of an electron travelling with a velocity of `7.0` megameters per second. The mass of an electron is `9.1 xx 10^-28 g`.

Options

A. `1.0 xx 10^-13 m`
B. `1.0 xx 10^-7 m`
C. `1.0 m`
D. `1.0 xx 10^-10 m`

Answer

D

Explanation

(d) Velocity `= 7 xx 10^6 meter`
`lamda = (h)/(mv) =(6.6 xx 10^-34)/(9.1 xx 10^-31 xx 7 xx 10^6) = 1 xx 10^-10 m`.