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27-04-2019
Physics

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A teacher 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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27-04-2019

the wavelength is to be 56.67 cm and I know that i should be applying the double slit equation for destructive interference.

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