1.

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

Answer»

`7.25xx10^(6)MS^(-1)`
`6.26xx10^(6)ms^(-1)`
`5.25xx10^(6)ms^(-1)`
`4.24xx10^(6 ms^(-1))`

Solution :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)`


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