The lightest particle in an atom is an electron, whose rest mass is 9.1 10-31 kg.
Question:
The lightest particle in an atom is an electron, whose rest mass is 9.1 × 10-31 kg. The energy equivalent of this mass is approximately
a. 10-13 J
b. 10-15 J
c. 3 × 10-23 J
d. 10-47 J
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