Physics, 31.01.2020 00:45 franvelpaulino2191
Ateacher stands well back from an outside doorway 0.88 m wide, and blows a whistle of frequency 780 hz. ignoring reflections, estimate at what angle(s) it is not possible to hear the whistle clearly on the playground outside the doorway.
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Ateacher stands well back from an outside doorway 0.88 m wide, and blows a whistle of frequency 780...
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