5. Two identical loudspeakers are arranged as shown and connected to the same signal generator. Line OR is equidistant from the speakers.

1. An observer moves along line PQ. State and explain the observation. (2 marks)

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1. If the frequency of sound from the generator is increased, what effect does this have on the interval at which the observer hears the soft sound? (1 mark)

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Speaker 1 Speaker 2 R P