Question #e4a84

Apr 25, 2017

(a) $\text{ } 2.31 \times {10}^{10}$

(b) $\text{ } 3.25 \times {10}^{12}$

Explanation:

Electrons are fundamental charges and each electron has a charge of $- 1.60 \cdot {10}^{- 19} C$.

In each case, divide the charge required by this value and you will get the number of electrons needed.

(a) $\frac{- 3.70 \cdot {10}^{- 9}}{- 1.6 \cdot {10}^{- 19}} = 2.31 \cdot {10}^{10}$

(b) $\frac{0.520 \cdot {10}^{- 6}}{- 1.6 \cdot {10}^{- 19}} = 3.25 \cdot {10}^{12}$