In Milikan’s experiment, static electric charge on the oil drops has been obtained by shining X-rays. If the static electric charge on the oil drop is –1.282 × 10–18C, calculate the number of electrons present on it.
Given:
Charge present on oil drop = –1.282 × 10–18 C
Charge of one electron = 1.6× 10-19 J
Charge on oil drop, = ne
Where
n = number of electrons
e = 1.6× 10-19 J
n = [–1.282 × 10–18 C] / [1.6× 10-19]
n = 8 electrons
Therefore, the number of electrons present on oil drop is 8 electrons.