A source of sound waves (wavelength A) is à distance I from a detector. Sound reaches the detector directly, and also by reflecting off an obstacle, as shown in the figure. The obstacle is equidistant from source and detector. When the obstacle is a distance d to the right of the line of sight between source and detector, as shown, the two waves arrive in phase. Figure Detector Source d Obstacle < 1 of 1
A source of sound waves (wavelength A) is à distance I from a detector. Sound reaches the detector directly, and also by reflecting off an obstacle, as shown in the figure. The obstacle is equidistant from source and detector. When the obstacle is a distance d to the right of the line of sight between source and detector, as shown, the two waves arrive in phase. Figure Detector Source d Obstacle < 1 of 1
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Transcribed Image Text:How much farther to the right must the obstacle be moved if the two waves are to be out of phase by
wavelength, so destructive interference occurs? (Assume X << 1, d.)
(Figure 1)
Express your answer in terms of the variables A, I, and d.
Ad=
15| ΑΣΦ
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Transcribed Image Text:A source of sound waves (wavelength A) is a distance I from a detector. Sound reaches the detector directly, and
also by reflecting off an obstacle, as shown in the figure. The obstacle is equidistant from source and detector.
When the obstacle is a distance d to the right of the line of sight between source and detector, as shown, the two
waves arrive in phase.
Figure
Detector
Source
d
Obstacle
1 of 1 >
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