List of top Chemistry Questions on de broglie hypothesis asked in MET

An electron, helium ion (\( \text{He}^{++} \)) and proton having the same kinetic energy. The relation between their respective de-Broglie wavelengths \( \lambda_e, \lambda_{\text{He}^{++}} \) and \( \lambda_p \) is

What is the wavelength associated with an electron moving with a velocity of \(10^6 \, \text{m/s}\)?
(\(h = 6.63 \times 10^{-34} \, \text{Js}\))

The ratio of de-Broglie wavelengths for electrons accelerated through \(200\,V\) and \(50\,V\) is: