The frequency of the alternating current supplied to a loudspeaker is increased. The size of the current is not changed. What happens to the sound produced?
Its pitch increases, because the cone vibrates more times each second
Its pitch decreases, because the cone vibrates fewer times each second
It becomes louder, because the cone moves a greater distance each time
It becomes quieter, because the cone has less time to move each way
39 exam-style questions on AQA GCSE Physics 7.2 The motor effect, covering 7.2.1 Electromagnetism, 7.2.2 Fleming's left-hand rule (HT only), 7.2.3 Electric motors (HT only), and 7.2.4 Loudspeakers (HT only). Each one has a worked solution and a mark scheme showing where the marks go.