Superposition of sound waves What to do This question is about superposition of sound waves from two loudspeakers. Answer the questions below, showing working where applicable. The experimental set-up Two loudspeakers separated by 3 m are connected to a signal generator. They are set up in the open air, well away from buildings. A student stands 10 m from the midpoint of the speakers, hearing a maximum amplitude sound and walks in front of them in the direction shown by OX until the sound drops to a minimum level. This occurs at point X as shown in the diagram. A X 1.5 m 3m 10 m 1.5 m B 1. How much further does sound from speaker B have to travel to reach the student than that from speaker A? 2. The position X was the point where the student heard the first minimum. How many wavelengths was the path difference between speaker A to X and speaker B to X? 3. What was the wavelength of the sound? 4. The speed of sound on that day was 340 m s–1. What was the frequency of the note? 5. Why should this experiment be performed outside?
