Question

Calculate the de-broglie wavelength of an electron with a kinetic energy of 100 ev

Answer 1

Answer:

Explanation:

Here is ans..

Answer 2

Answer:

Explanation:For calculating the de-broglie wavelength of an electron we must know the following things:

Mass of an electron:9.1 X 10^-31kg

h:6.62X10^-34

1ev=1.6X10^-19J

Given that KE of electron is 100ev ,

100ev=1.6X10^-19X 100

=1.6X10^-17J

And by formula

Wavelength ( lambda)=h/√(2mK.E.)

=6.62X10^-34/√(2X9.1X10^-31X1.6X10^-17)

= 1.22X10^-10m