Physics Question from JEE Main 2026 · 21 January, Shift 2

A particle having electric charge $3 \times 10^{-19} \, \text{C}$ and mass $6 \times 10^{-27} \, \text{kg}$ is accelerated by applying an electric potential of $1.21 \, \text{V}$. Wavelength of the matter wave associated with the particle is $\alpha \times 10^{-12} \, \text{m}$. The value of $\alpha$ is _____ (Take Planck's constant $= 6.6 \times 10^{-34} \, \text{J.s}$)