Correct Answer: Option A

Explanation

The mass of a proton is 1.6726×10−24 g, while the mass of a proton = 1.00727 a . m. u. so OPTION A is correct because the mass of an electron is \(\frac{1}{1840}\) of that of a proton, which is the same as say the mass of a proton is 1840 times the mass of an electron.

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