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The speed of an electron having a wavele...

The speed of an electron having a wavelength of `10^(-10) m` is

A

`7.25xx10^(6) m//s`

B

`5.25 xx 10^(6) m//s `

C

`6.26 xx 10^(6) m//s `

D

`4.24 xx 10^(4) m//s ` .

Text Solution

Verified by Experts

The correct Answer is:
A
Wavelength `(lambda ) =10^(-10) m`
Velocity of the electron , `v=h//mlambda `
`= (6.6xx10^(-34))/((9.1 xx 10^(-31))(10^(-10)))=7.25 xx 10^(6) m//s `
where m= mass of electron equal to ` 9.1 xx 10^(-31)` kg and h is Planek constant equal to `6.6 xx 10^(-34)` J-s
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