Solution: A teacher stands well back from an outside doorway
Chapter , Problem 66(choose chapter or problem)
A teacher stands well back from an outside doorway 0.88 mwide, and blows a whistle of frequency 850 Hz. Ignoringreflections, estimate at what angle(s) it is not possible to hearthe whistle clearly on the playground outside the doorway.Assume 340 m/s for the speed of sound.
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