The ratio of de-Broglie wavelength of electron and proton moving with the same speed is about — Atomic Structure Chemistry Question

💡 Solution & Explanation

De-Broglie wavelength $\lambda = \frac{h}{mv}$. Since their speeds are the same, $\lambda$ is inversely proportional to mass. $\frac{\lambda_e}{\lambda_p} = \frac{m_p}{m_e} \approx 1836$. The ratio is roughly 1836:1. Therefore, correct answer is A.