2 A boy wishes to demonstrate interference of sound waves to nise large loudspeakers in his school playing field. He therefore sets up the two use two land loudspeakers separated by about 50 m and connected to a CD player through an amplifier. He switches on his CD player, which plays the West Indies cricket anthem. (i) Outline the method he should use to find out whether or not he is obtaining interference of the sound from the two speakers. (ii) How would he know whether his experiment is successful? (iii) Do you think his experiment is likely to be successful? Give a reason for your answer

To determine if he is obtaining interference of sound from the two speakers, the boy can set up a microphone or sound level meter at various points along a line that bisects the space between the speakers. By moving this device back and forth, he should listen for changes in sound intensity or measure the sound levels at regular intervals. If he observes alternating loud and soft sounds (a pattern of constructive and destructive interference), it would indicate that interference is occurring. To ascertain the success of his experiment, he should look for a clear pattern in the sound intensity readings recorded by the microphone or meter. If the sound levels fluctuate significantly at regular intervals, this would suggest constructive and destructive interference is taking place. He could also compare the sound heard at the microphone's position to the original sound coming from each speaker individually to see if the effect is noticeable. While his experiment could indeed be successful, it heavily relies on the frequency of the sound waves and the positioning relative to the speakers. The distance (50 m) may allow for some interference patterns to form, but environmental factors like wind direction, background noise, and obstacles could disrupt the clarity of the interference bands. Therefore, success is possible but isn't guaranteed without controlled conditions.