A Proton and an Electron Are Both Accelerated to the Same

Multiple Choice

A proton and an electron are both accelerated to the same final speed. If $\lambda _ { p }$ is the de Broglie wavelength of the proton and $\lambda _ { \mathrm { e } }$ is the de Broglie wavelength of the electron, then

A) $\lambda _ { p } < \lambda _ { e }$ .
B) $\lambda _ { p } = \lambda _ { e }$
C) $\lambda _ { p } > \lambda _ { e }$ .