State the direction taken by the electric field.
Calculate the distance between A and B.
Calculate the magnitude of the electric field strength.
At $t = 0$, the $\alpha$-particle is at point A. On Fig. 4.2, sketch how the momentum of the $\alpha$-particle changes with time $t$ as it moves from point A to point B. No numerical values are needed.
State the physical quantity shown by the gradient of the graph in (d).
A $\beta^{-}$ particle enters the electric field along the same initial route as the $\alpha$-particle and with the same initial speed of $4.1 \times 10^{6}\,\text{m s}^{-1}$. Calculate the kinetic energy, in J, of the $\beta^{-}$ particle at point A.
State and explain how the electric force on the $\beta^{-}$ particle in the electric field differs from the electric force on the $\alpha$-particle in the electric field.
The $\beta^{-}$ particle is created in the decay of a nucleus. State the name of another lepton created at the same time as the $\beta^{-}$ particle.