A β⁻ particle from a radioactive source is travelling in a vacuum with kinetic energy 460 eV. The particle enters a uniform electric field at a right-angle and follows the path shown in Fig. 7.1. β⁻ particle kinetic energy 460 eV path of β⁻ particle uniform electric field in the plane of the paper Fig. 7.1

1. (a)The direction of the electric field is in the plane of the paper. On Fig. 7.1, draw an arrow to show the direction of the electric field.[1]
2. (b)Calculate the speed of the β⁻ particle before it enters the electric field. speed =[3]
3. (c)Other β⁻ particles from the same radioactive source travel outside the electric field along the same incident path as that shown in Fig. 7.1. State and briefly explain whether those β⁻ particles will all follow the same path inside the electric field.[2]

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