Use the quark model to show that

1. (a)Use the quark model to show that
2. (a)(i)the charge on a proton is +e,[1]
3. (a)(ii)the charge on a neutron is zero.[1]
4. (b)A nucleus of ⁹⁰Sr decays by the emission of a β⁻ particle. A nucleus of ⁶⁴Cu decays by the emission of a β⁺ particle.
5. (b)(i)In Fig. 7.1, state the nucleon number and proton number for the nucleus produced in each of these decay processes. [Figure 7.1][1]
6. (b)(ii)State the name of the force responsible for β decay.[1]
7. (b)(iii)State the names of the leptons produced in each of the decay processes. β⁻ decay: β⁺ decay:[1]

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