Question

If mass of an electron is 9.11 into 10 to the power minus 31 kg then its mass is in the order of

Answer 1

Answer:

K.E. = 1/2 mv2

∴ v = √2 K.E./m

= 812 ms-1

By de Broglie equation, λ = h/mv = 6.626×10-34 Js/(9.11×10-31 kg) (812 ms-1) = 8.967×10-7 m