Answer:
I think the second option is correct
please mark me as brainliest
Explanation:
It is given that,
Net force acting on the electron, 
Displacement, d = 5 cm = 0.05 m
(a) Let
is the change in kinetic energy of the electron. It can be calculated using work energy theorem. Mathematically, it is given by :




(b) Initial speed of the electron, u = 0
Again using the work energy theorem as :




Hence, this is the required solution.
Is there any Examples/Answers or is it simply just explain it in a text box?
Velocity of a wave = wavelength * frequency
The velocity may change and the wavelength may change--- the frequency stays constant!