An electron (mass m) with an initial velocity 
is in an electric field 
. If 
, it's de-Broglie wavelength at time t is given by:
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
C
Initial de-Broglie wavelength of electron,
Force on electron in electric field,
Acceleration of electron,
It is acting along negative y -axis.
The initial velocity of electron along x -axis, 
.
Initial velocity of electron along Y -axis, 
.
Velocity of electron after time t along x -axis, 
.
( ∵ There is no electron along x -axis.)
Velocity of electron after time t along y-axis,
de-Broglie wavelength,
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