Speed of electron with wavelength `10^(-10)` m will be…….

Options

A. `7.25xx10^(6)ms^(-1)`
B. `6.26xx10^(6)ms^(-1)`
C. `5.25xx10^(6)ms^(-1)`
D. `4.24xx10^(6 ms^(-1))`

Answer

A

Explanation

de-Broglie wavelength of electron ,
`lambda=(h)/(p)=(h)/(mv)`
`therefore v=(h)/(mlambda)=(6.6xx10^(-34))/(9.1xx10^(-31)xx10^(-10))`
`therefore v=0.72527xx10^(7)`
`therefore v~~7.25xx10^(6)ms^(-1)`