Energy due to potential difference = Ek= Q× V
Where Q = charge of an electron= 1.602×10^(-19) C , and V= 1×10^4 V , therefore
Ek = 1×10^4×1.602×10^(-19) joule
And 1 eV = 1.602 ×10^(-19) J ,
or 1 Joules = 1÷( 1.602 ×10^(-19) ) eV
Therefore the electron energy is = 1×10^4 eV , hence option (a) is correct.
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