4 years ago

A 25eV electron has a speed of

Physics

2 answers:

dexar [7]4 years ago

5 0

Answer : <em>3 x 106m/sec</em>

fgiga [73]4 years ago

3 0

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)

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