1.

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)

Answer»

`10^(3)`
`1.2xx10^(3)`
`1.4xx10^(3)`
`2.8xx10^(3)`

SOLUTION :`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`


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