Editor
Editor
 Sep 18, 2022
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Mass of simple electron is:
Difficulty: Easy
A: 
$9.1\times 10^{31}$ kg
B: 
$9.1\times 10^{-30}$ kg
C: 
$1.66\times 10^{-31}$ kg
D: 
$9.1\times 10^{-31}$ kg
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