Calculate the mass of a proton if the charge to mass ratio of an electron is 1.758820×1011 C kg−1 and it is known that the mass of a proton is 1837 times greater than the mass of an electron.
A
9.1×10−31 kg
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B
6.4×1031 kg
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C
1.67×10−27 kg
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D
6.02×1023 kg
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Solution
The correct option is C1.67×10−27 kg em=1.758820×1011 C kg−1
We know that, e=1.602×10−19 C
So, mass of electron = 9.1×10−31 kg
Also the mass of a proton is 1837 times the mass of an electron. So, mass of proton =1837×9.1×10−31 kg=1.67×10−27 kg