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Q.

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 × 1018Ccalculate the number of electrons present on it.

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answer is 8.

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Detailed Solution

Charge on one electron = - 1.6022 × 10-19CLet, number of electrons = N Then total charge =−N×1.6022×10−19C Given, total charge =−1.282×10−18C Thus, −N×1.6022×10−19C=−1.282×10−18C∴ N=8
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