An electron of mass 
with a velocity 
enters an electric field 
constant 
at 
. If 
is its de-Broglie wavelength initially, then its de-Broglie wavelength at time 
is [NEET 2018]
Text Solution
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According to the question,
Thus, magnitude of force on the electron due to the electric field,
From Newton's second law of motion,
…… (i) 
From first equation of motion, 
Here, 
(initial velocity) 
…… ..(ii)
Initial de-Broglie wavelength of the electron is given as
……… (iii)
After time 
, de-Broglie wavelength is given as
Substituting the value of 
from Eq. (ii), we get
[from Eq. (iii)]
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