Question: please help this thermodynamics and wave questions with clear steps and details, thanks 5. A teacher stands well back from an outside doorway 0.88 m
please help this thermodynamics and wave questions with clear steps and details, thanks

5. A teacher stands well back from an outside doorway 0.88 m wide, and blows a whistle of frequency 780 Hz. Ignoring reections, estimate at what angle(s) it is not possible to hear the whistle clearly on the playground outside the doorway
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