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NCERT Class XI Chemistry Structure of Atom Solutions

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Question : 39
Total: 67
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 × 10–18 C, what will be the number of electrons present on it?
Solution:  
Charge of one electron = – 1.602 × 10–19 C
Number of electrons =
−1.282×10−18
−1.602×10−19
 = 8
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