he diffraction phenomenon occurs for all types of waves, including sound waves. A high-frequency sound emitted by a distant source has a wavelength of 9.00 cm and crosses a thin slit a = 12.0 cm wide. A microphone is located at a distance D = 40.0 cm in front of the center of the slot (point O in the figure). The microphone is moved to point P, where the intensity it detects is zero. a) What is the distance d between points O and P? b) How many minima will still be detected if the microphone is moved more than the O point?

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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.