iran-konkur 2014 Q186

iran-konkur · Other · konkur-riazi_1393 Not Maths
186. A proton and an alpha particle $\alpha$ with equal kinetic energies enter a magnetic field of magnitude $B$ and move in circular paths perpendicular to the magnetic field. Which of the following statements about these two particles is correct? (Mass of alpha particle $\alpha$ is 4 times the mass of the proton.)
  • [1)] The speed of $\alpha$ is 2 times the speed of the proton.
  • [2)] The momentum of the proton equals the momentum of particle $\alpha$.
  • [3)] The radius of the path of $\alpha$ equals the radius of the path of the proton.
  • [4)] The electromagnetic force on the proton is 2 times the electromagnetic force on particle $\alpha$.
\textbf{186.} A proton and an alpha particle $\alpha$ with equal kinetic energies enter a magnetic field of magnitude $B$ and move in circular paths perpendicular to the magnetic field. Which of the following statements about these two particles is correct?\\
(Mass of alpha particle $\alpha$ is 4 times the mass of the proton.)

\begin{itemize}
    \item[1)] The speed of $\alpha$ is 2 times the speed of the proton.
    \item[2)] The momentum of the proton equals the momentum of particle $\alpha$.
    \item[3)] The radius of the path of $\alpha$ equals the radius of the path of the proton.
    \item[4)] The electromagnetic force on the proton is 2 times the electromagnetic force on particle $\alpha$.
\end{itemize}