In Milikan's experiment, static electrons charge on the oil drops has been obtained by shining X-rays. If the static electric charge on the oil drop is `-1.282xx10^(-18)C`, calculate the number of electrons present on it.

Explanation

Change on the oil drop `= 1.282 xx 10^(-18) C`
Charge on one electron `= 1.6022 xx 10^(19)C`
`:.` Number of electrons present on the oil drop
`= (1.289 xx 10^(-18) C)/(1.6022 xx 10^(-19)C)`
`= 0.08001 xx 10^(1)`
`= 8.0`