Question

How many revolutions does an electron complete in one second in the first orbit of hydrogen atom ?

• A. 6.62 × 10¹⁵
• B. 100
• C. 1000
• D. 1

Answer 1

Answer: (A)

6.62 × 10¹⁵

Answer 2

Frequency of revolution

f = $\frac{mt^{2}e^{4}}{4\varepsilon_{0}^{2}n^{3}h^{3}}$

or f = 6.6 × 10¹⁵ × $\frac{z^{2}}{n^{3}}$

Now; z = 1, n = 1

f = 6.6 × 10¹⁵ Hz