The ratio of the speed of the electron in the ground state of hydrogen atom to the speed of light in — Atomic Structure Chemistry Question

💡 Solution & Explanation

The speed of an electron in the first Bohr orbit ($n=1, Z=1$) is given by $v = \frac{e^2}{2\epsilon_0 h} = \frac{c}{137}$. The ratio $v/c \approx 1:137$. Therefore, correct answer is C.