A moving-coil microphone diaphragm completes 150 vibrations in 0.50 s. Its signal is amplified without changing frequency and supplied to a loudspeaker.
How many complete vibrations does the loudspeaker cone make in 2.0 s?
600 vibrations
150 vibrations
300 vibrations
1200 vibrations
92 exam-style questions on Edexcel GCSE Physics 13.1 Inducing a current, covering 13.1.1 Producing an electric current by induction, 13.1.2 Factors affecting the induced potential difference, 13.1.3 Alternators and dynamos, and 13.1.4 Microphones and loudspeakers. Each one has a worked solution and a mark scheme showing where the marks go.