A deuteron and a proton moving with equal kinetic energy enter into to a uniform magnetic field at right angle to the field. If r_d and r_p are the…

A deuteron and a proton moving with equal kinetic energy enter into to a uniform magnetic field at right angle to the field. If $\displaystyle r_d$ and $\displaystyle r_p$ are the radii of their circular paths respectively, then the ratio $\displaystyle \frac{r_d}{r_p}$ will be $\displaystyle \sqrt{x}: 1$ where $\displaystyle x$ is \_\_\_\_.