The wavelenghts of electrons accelerated from rest through a potential difference of \( 40 \math...

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The wavelenghts of electrons accelerated from rest through a potential difference of \( 40 \mathrm{kV} \) is \( \mathrm{x} \times 10^{-12} \mathrm{~m} \). the value of \( \mathrm{x} \) is
Given: Mass of electron \( =9.1 \times 10^{-31} \mathrm{~kg} \)
Charge on an electron \( =1.6 \times 10^{-19} \mathrm{~kg} \)
Plancks constant \( =6.63 \times 10^{-34} \mathrm{Js} \)
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