can someone help me?? Diffraction occurs for all types of waves, including sound

Question

can someone help me??

Diffraction occurs for all types of waves, including sound waves. High-frequency sound from a distant source with wavelength 8.80cm passes through a narrow slit 12.5cm wide. A microphone is placed 43.0cm directly in front of the center of the slit, corresponding to point O in the figure 36.5a in the textbook. The microphone is then moved in a direction perpendicular to the line from the center of the slit to point O At what minimal distance from O will the intensity detected by the microphone be zero?

Explanation / Answer

y = L lamda/a = 0.43 * 0.088/0.125 = 0.30272 m = 30.3 cm

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