First slide

Sub-atomic particles

Question

In Millikan'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 × 10¹⁸C
calculate the number of electrons present on it.

Moderate

Solution

Charge on one electron = - 1.6022 × 10^-19C
Let, number of electrons = N
$\begin{array}{l} Then total charge = - N \times 1 .6022 \times 10^{- 19} C \\ Given, total charge = - 1 .282 \times 10^{- 18} C \\ Thus, - N \times 1 .6022 \times 10^{- 19} C = - 1 .282 \times 10^{- 18} C \\ ∴ N = 8 \end{array}$

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