Sound (speed = 343 m/s) exits a diffraction horn loudspeaker through a rectangular opening like a small doorway. A person is sitting at an angle α off to the side of a diffraction horn that has a width D of 0.070 m. This individual does not hear a sound wave that has a frequency of 11000 Hz. When she is sitting at an angle of α/2, the frequency that she does not hear is different. What is this frequency?

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Interference of Light

The word "constructive" signifies addition in interference. Constructive interference occurs when the path of the waves that start from the slit differs by 1 entire wavelength or in the intervals of the same. Hence, the waves that are presented on the screen are in phase (crest to crest/trough to trough). The waves interfering constructively forms bright fringes on the screen.