Double-Slit Interference: Two Small Forward-Facing Speakers Are 2

question 37

Multiple Choice

Double-slit interference: 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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Definitions:

Thalamus

The forebrain structure that sits at the top of the brain stem in the brain’s central core and serves as an important relay station.

Two-factor Theory

The Two-factor Theory proposes that human emotions are the result of a combination of physiological arousal and the cognitive labeling of that arousal.

Drive Reduction Theory

A motivational theory proposing that the maintenance of homeostasis motivates behavior that reduces drives arising from physiological needs.

James-Lange Theory

A psychological theory suggesting that emotions result from people's interpretations of bodily reactions to external events.