Question

Which of the following particles has the largest wavelength? Assume all particles have the same velocity.

• A. $C{O}_2$
• B. $N{H}_3$
• C. Electron
• D. Proton

Answer 1

The correct option is C Electron

From de-Broglie equation,
$\lambda =\frac{h}{mv}$
At constant velocity, wavelength $\left(\lambda \right)$ is inversely proportional to mass of the particle.
From the given options, mass of the electron is least $(m=9.1\times {10}^{-31}kg)$. So, wavelength of electron is the largest.