A teacher stands well back from an outside doorway wide and blows a whistle of frequency . Ignoring reflections, estimate at what angle(s) it is not possible to hear the whistle clearly on the playground outside the doorway. Assume for the speed of sound
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Answer: A teacher stands well back from an outside doorway 0.97 m wide, and blows a whistle of frequency 950 Hz. Ignoring reflections, estimate at what angle(s) theta_m min (0 degrees < theta_m min < 90 degrees) it is not possible to hear the whistle clearly on the playground outside the doorway. Assume 340 m/s for the speed of speed. Express your answers using two significant figures separated by a comma.
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