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The mass of a proton is about how many times that of an electron?
A2000
B3000
C5000
D9000
Answer & Solution
Correct answer: A. 2000
1. The proton came out of the study of canal rays.
2. It is far heavier than the electron.
3. Its mass is about 2000 times greater.
_Source: NCERT Class 9 Science, Ch 4 'Structure of the Atom'_
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