Question

8. The current in a Crookes tube is$10nA$. How many electrons strike the face of the glass tube each second?

Short answer

Total number of electrons striking the surface are $6.25\times {10}^{10}$.

Step-by-step solution

Step 1. Given information

The current in a Crookes tube is given as$10nA$.

Step 2. Simplify

current is defined as charge per unit time

$i=\frac{n\times e}{t}$

where n =number of electrons , e =charge of each electron($1.6\times {10}^{-19}$) and t is time ($1$sec) .

solving

$n=\frac{i\times e}{t}=\frac{10\times {10}^{-9}\times 1}{1.6\times {10}^{-19}}=6.25\times {10}^{10}$