18. Waves & Sound
Wave Interference
18. Waves & Sound Wave Interference
7PRACTICE PROBLEM
A vehicle (at rest) is fitted with two sirens that are 2.2 m apart. The sirens are operated by the same circuitry, emitting pure sine waves that are in phase. A point S lies 1.1 m on one side measured from the sirens. For sound waves traveling straight from the siren to point S, calculate the least frequency that causes destructive interference at point S.
A vehicle (at rest) is fitted with two sirens that are 2.2 m apart. The sirens are operated by the same circuitry, emitting pure sine waves that are in phase. A point S lies 1.1 m on one side measured from the sirens. For sound waves traveling straight from the siren to point S, calculate the least frequency that causes destructive interference at point S.