Question

The mass of an electron is 9.1x10-31 kg if its kinetic energy is 3.0x10-25 J, calculate the Wave length

Answer 1

as Kinetic energy=1/2 mv^2
vel. of electron will be=0.811×10^6

BY DE-BROGLIE'S EQ. (wavelength= plank's constant/momentum)
wavelength=6.62×10^-34/(9.1×10^-31×0.811×10^6)
=0.897×10^-9 m