Two Small Forward-Facing Speakers Are 2

question 25

Multiple Choice

Two small forward-facing speakers are 2.50 m apart.They are both emitting,in phase with each other,a sound of frequency 1100 Hz in a room where the speed of sound is 344 m/s.A woman is standing opposite the midpoint between the speakers and is initially 35.0 m from the midpoint.As she slowly walks parallel to the line connecting the speakers,at what angle θ (relative to the centerline coming outward from the midpoint between the speakers) will she first hear no sound?

• A) 0.063°
• B) 3.6°
• C) 7.2°
• D) 1.8°
• E) 11°

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