Question

2) calculate the wavelength of an
electron moving at
3.0 x 10^10 cm sec^-1
mass of electron=9.11 X 10^-31 kg
h=6.6 X 10-34 kg m^2sec^-1​

Answer 1

Step-by-step explanation:

Given:

mass of an electron = 9.1×10

−31

kg

kinetic energy = 3.0×10

−25

J

h = 6.6×10

−34

Js

By using de- Broglie equation :

λ=

mv

h

=

p

h

,where h = Planck's constant, p= momentum

as P =

2×E×m

, by subtituting the value of p we get,

wavelength =

2×E×m

h

(E= kinetic energy )

wavelength =

2×3×10

−25

×9.1×10

−31

6.6×10

−34

= 0.89×10

−6

m