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The wavelength of electrons accelerated ...

The wavelength of electrons accelerated from rest through a potential difference of 40 kV is `x - 10 ^(-12) m.`
The value of x is ________ (Nearest integer)
Given : Mass of electron `= 9.1 xx 10 ^(-31) kg`
Charge on a electron `= 1. 6 xx 10 ^(-19) C`
Planck's constant `= 6.63 xx 10 ^(-34) Js`

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