An electron in a cathode ray tube is accelerated through a potential difference of 8.0 kV.What kinetic energy does the electron gain in the process? (e = 1.6 × 10−¹⁹ C) A)1.0E-15 J B)1.3E-15 J C)1.0E-21 J D)5.0E-16 J E)1.3E-21 J

Question

Quizplus · Accepted Answer

The kinetic energy gained by an electron can be calculated by:
K.E. = qV
where q is the charge of the electron and V is the potential difference.

Substituting the given values, we get:
K.E. = (1.6 × 10^-19 C) × (8.0 × 10^3 V) 
K.E. = 1.28 × 10^-15 J

Therefore, the correct answer is B) 1.3E-15 J.

An Electron in a Cathode Ray Tube Is Accelerated Through