Question

If $e=1.60206\times {10}^{-19}C,\frac{e}{m}=1.75875\times {10}^{11}Ck{g}^{-1}$, then the mass of electron is:

• A. $7.5678\times {10}^{-31}kg$
• B. $9.1091\times {10}^{-31}kg$
• C. $11.2531\times {10}^{-31}kg$
• D. $13.0513\times {10}^{-31}kg$

Answer 1

The correct option is B $9.1091\times {10}^{-31}kg$

mass of electron=$\frac{1.60206\times {10}^{-19}}{1.75875\times {10}^{11}}=9.1091\times {10}^{-31}$