Question

An electron of mass m with an initial velocity enters an electric field (constant ) at . If is its de-Broglie wavelength initially, then its de-Broglie wavelength at time t is?

A

B

C

D

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Solution

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Correct option is
C

R.E.F image
The diagram will be :-Β 
Initial velocity
Acceleration is constant :-
Final velocity
(at time t)
Now, at de-Broglie wavelength
Let at time t, de-Broglie wavelength
Then,
Β 

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