Determine the kinetic energy of an electron in an X-ray tube if it operates under a voltage of 150 kV.

The kinetic energy of an electron in an X-ray tube can be determined by the formula:
Ek = (m * V ^ 2) / 2 = e * U, where e is the electron charge (e = 1.6 * 10 ^ -19 C), U is the voltage in the X-ray tube (holding voltage, U = 150 kV = 150 * 10 ^ 3 V).
From here we determine the value of kinetic energy:
Ek = e * U = (1.6 * 10 ^ -19) * 150 * 10 ^ 3 = 240 * 10 ^ -16 = 2.4 * 10 ^ -14 J.
Check: J = Cl * B = J.
Answer. The kinetic energy of an electron in an X-ray tube is 2.4 * 10 ^ -14 J.