Two Loudspeakers S₁ and S₂, 3

question 8

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:

Inattentional Blindness

A psychological phenomenon where an individual fails to perceive an unexpected stimulus in plain sight, due to the focus being elsewhere.

Information-Processing Perspective

A cognitive approach that likens the mind to a computer, focusing on how information is taken in, processed, stored, and retrieved.

Activation-Synthesis Theory

A theory proposing that dreams are the result of the brain's attempt to make sense of random neural activity during REM sleep.

Cognitive Development

The process by which individuals learn and develop mental skills throughout their lives, including thinking, learning, problem-solving, and decision-making.