Question

In an atom electrons revolves around the nucleus along a path of radius $0.72\stackrel{o}{A}$ making $9.4\times {10}^{18}$ revolution per second. The equivalent current is $(e=1.6\times {10}^{-19}C)$.

• A. $1.2$A
• B. $1.5$A
• C. $1.4$A
• D. $1.8$A

Answer 1

The correct option is B $1.5$A

Radius of electron orbit $r=0.72\stackrel{o}{A}=0.72\times {10}^{-10}$m
Frequency of revolution of electron in orbit of given atom $v=9.4\times {10}^{18}$ rev/s
(where T is time period of revolution of electron in orbit)
$\therefore$ Then equivalent current is
$I=\frac{e}{T}=ev=1.6\times {10}^{-19}\times 9.4\times {10}^{18}=1.504$ A.