Two Loudspeakers S₁ and S₂, 3

question 94

Multiple Choice

Two loudspeakers S₁ and S₂, 3.0 m apart, emit the same single-frequency tone in phase at the speakers. A listener L directly in front of speaker S₁ notices that the intensity is a minimum when she is 4.0 m from that speaker see figure) . What is the lowest frequency of the emitted tone? The speed of sound in air is 340 m/s.

• A) 85 Hz
• B) 0.17 kHz
• C) 0.26 kHz
• D) 0.34 kHz
• E) 0.51 kHz

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Definitions:

Shadowing

A technique used in psychological research to study attention and language processing, involving repeating speech immediately after hearing it.

Convergence

A binocular cue for depth based on the inward movement of the eyes as they attempt to focus on an object that is drawing nearer.

Sensitization

The process by which repeated exposure to a stimulus increases the response to that stimulus over time.

Subliminal Stimulation

The process of influencing someone's mind with stimuli (visual or auditory) below the threshold of conscious perception.