(a) P a For the two strips shown, the path difference to P is (a/2) sin 0. When (a/2) sin 0 = ^/2, the light cancels at P. This is true for the whole slit, so P represents a dark fringe.

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Diffraction occurs for all types of waves, including sound waves. High-frequency sound from a distant source with wavelength 9.00 cm passes through a slit 12.0 cm wide. A microphone is placed 8.00 m directly in front of the center of the slit, corresponding to point O in Fig. The microphone is then moved in a direction perpendicular to the line from the center of the slit to point O. At what distances from O will the intensity detected by the microphone be zero?

(a)
P
a
For the two strips shown, the path difference to P is (a/2) sin 0.
When (a/2) sin 0 = ^/2, the light cancels at P. This is true for the
whole slit, so P represents a dark fringe.
Transcribed Image Text:(a) P a For the two strips shown, the path difference to P is (a/2) sin 0. When (a/2) sin 0 = ^/2, the light cancels at P. This is true for the whole slit, so P represents a dark fringe.
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