If the momentum of an electron is required to be same as that of wave of 5200 Å wavelength, its velocity should be …….`ms^(-1)`

Options

A. `10^(3)`
B. `1.2xx10^(3)`
C. `1.4xx10^(3)`
D. `2.8xx10^(3)`

Answer

C

Explanation

`lambda=5200 Å=52xx10^(-8)m,`
`h=6.62xx10^(-34)Js`
`m=9.1xx10^(-31)Kg`
`p=mv=(h)/(lambda)`
`therefore v=(h)/(mlambda)`
`v=(6.62xx10^(-34))/(9.1xx10^(-31)xx52xx10^(-8))`
`v=1.4xx10^(3)m//s`