A beam of electrons is subjected to 45.5 KV electric potential. Assuming that the electrons before passing the electric

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A beam of electrons is subjected to 45.5 KV electric
potential. Assuming that the electrons before passing the
electric potential were at rest (their KE is 0), then λ of the
electrons after emerging from the electric potential is:
Given: Joule = CoulombXVolt; Mass of electron is
9.109X10-28 g;
charge on electron is 1.602X10-19 Coulomb; KE =
½ mv2; P = mv; λ = h/P; and h is
6.626X10-34 J.sec)
A) 2.97X10-9 m
B) 3.34X10-11 m
C) 7.67X10-10 m
D) 5.77X10-12 m