A station announcement is played through a loudspeaker. The amplitude of the alternating current in the loudspeaker is reduced, while its frequency stays the same.
What happens to the sound from the loudspeaker?
It becomes louder while its pitch stays the same.
It becomes quieter while its pitch stays the same.
It becomes quieter and its pitch becomes lower.
Its loudness stays the same and its pitch becomes lower.
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.