A 25eV electron has a speed of

Question

Physics

Gregory Dunn

28 February, 16:44

A 25eV electron has a speed of

+2

Answers (2)

Know the Answer?

Gator · Answer 1

Answer : 3 x 106m/sec

Lance Bell · Answer 2

Answer: 2.963*10⁶ m/s

Explanation:

Work done = kinetic energy

K. E = eV

½mv² = eV

v² = 2eV / m.

Mass of an electron = 9.11*10-³¹kg

Energy of an electron = 1.60*10-¹⁹J

v² = (2 * 25 * 1.60*10-¹⁹) / 9.11 * 10-³¹

v = 2.96*10⁶m/s

Note : you'll have to take the square root of velocity (v)