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

---

Definitions:

Total Demand

Total demand represents the entire quantity of a particular good or service that all consumers in a market are willing to purchase at various price points over a specific time frame.

Exclusive Right

A legal authorization to be the sole provider or producer of a particular product or service, or to use a specific piece of intellectual property.

Cable Television

A system of delivering television programming to paying subscribers via radio frequency (RF) signals transmitted through coaxial cables.

Marginal Revenue

The increase in revenue that results from selling one additional unit of a product or service.