Two In-Phase Loudspeakers Are Some Distance Apart

question 32

Multiple Choice

Two in-phase loudspeakers are some distance apart. They emit sound with a frequency of 1536 Hz. You move between the speakers, along the line joining them, at a constant speed of 2.8 m/s. What beat frequency do you observe? The speed of sound in the room is 330 m/s.

• A) 13 Hz
• B) 431 Hz
• C) 26 Hz
• D) 4.7 Hz
• E) 118 Hz

---

Definitions:

Catharsis

A process of releasing, and thereby providing relief from, strong or repressed emotions.

Informed Consent

The process by which a fully informed person can participate in choices about their health care or participation in research.

Volunteer Bias

The phenomenon in research where volunteers may differ from the general population in significant ways, potentially leading to skewed results due to the self-selection of participants.

Conditioning

A method of changing behavior where an individual learns to link a new behavior with a stimulus that was previously not related to it.