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19. An electron (mass m) with initial velocity i = voi + voj is in an electric field
É = -E,k. If 1o is initial de-Broglie wavelength of electron, its de-Broglie
wavelength at time t is given by
do
a. A =
1+
m2 t?
b. A=
1+
t2
m²u
λο
c. A =
1+
t2
2m² v
do
d. A =
2+

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