State the name of another lepton that is produced in the decay.

1. (a)(i)State the name of another lepton that is produced in the decay.[1]
2. (a)(ii)State the name of the interaction (force) that gives rise to this decay.[1]
3. (a)(iii)State which of the three particles (proton, neutron or β+ particle) has the largest ratio of charge to mass.[1]
4. (a)(iv)Use the quark model to show that the charge on the proton is +e, where e is the elementary charge.[2]
5. (a)(v)The quark composition of the proton is changed during the decay. Describe the change to the quark composition.[1]
6. (b)(i)Determine the ratio electric force acting on nucleus X electric force acting on nucleus Y[2]
7. (b)(ii)Determine the ratio acceleration of nucleus X due to the field acceleration of nucleus Y due to the field[1]
8. (b)(iii)Nucleus X is at rest in the uniform electric field at time t = 0. The field causes nucleus X to accelerate so that it moves through the field. On Fig. 6.1, sketch the variation with time t of the acceleration a of nucleus X due to the field. [Figure 6.1][1]

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