Calcuate the wavelength of a moving electron having ` 4 . 55 xx 10 ^(-25) J` of kinetic enrgy .

Explanation

Kinetic energy ` = 1/2 m u^2 = 4. 55 xx 10^(-25) J`
` :. u^2 = ( 2 xx 4.55 xx 10 ^(-25))/( 9. 108 xx 10^(-31))`
` :. U = 10 ^3 m sec^(-1)`
` :. lambda = (h)/( m u) = ( 6.626 xx 10^(-34))/( 9. 108 xx 10^(-31) xx 10^3)`
` = 7. 27 xx 10^(-7) meter `.