An electron is accelerated from rest to 8.5x10^7 m/s. what voltage did the electron fly through?

The final kinetic energy of the electrons is  

Explanation:

According to the Special Theory of Relativity, when a particle is in motion with a constant velocity, it is a substantial fraction of the speed of light. To describe the motion of the moving particle, Einstein's special theory of relativity is required.  

For the above-given question, it can be solved by using the below mention formula,

K = qV

where:

q is the charge

V is the potential difference

It is given that

V, Voltage difference is of 120 k V =  120 x 10³V

q will be equal to e, q = e =    

explanation: magnetic pole, region at each end of a magnet where the external magnetic field is strongest. the south-seeking pole, or any pole similar to it, is called a south magnetic pole. unlike poles of different magnets attract each other; like poles repel each other.