Two loudspeakers emit $400 \mathrm{Hz}$ notes. One speaker sits on the ground. The other speaker is in the back of a pickup truck. You hear eight beats per second as the truck drives away from you. What is the truck's speed?
Added by Randall H.
Step 1
We know that the beat frequency is the difference between the frequencies of the two speakers. In this case, we hear 8 beats per second, so the difference in frequencies is 8 Hz. Show more…
Show all steps
Your feedback will help us improve your experience
Madhur L and 56 other Physics 101 Mechanics educators are ready to help you.
Ask a new question
Labs
Want to see this concept in action?
Explore this concept interactively to see how it behaves as you change inputs.
Key Concepts
Recommended Videos
Two identical loudspeakers emit 400.0 Hz notes. One speaker sits on the ground. The other speaker is in the back of a pick-up truck. You hear eight beats per second as the truck drives away from you. What is the truck's speed? Use 343.0 m/s for the speed of sound in air. First write the equation(s) you used to determine an answer, then substitute numerical values, and write the numerical answer to four significant figures. {7.000 m/s}
Khoobchandra A.
A fire truck's siren at rest wails at $1400 \mathrm{Hz} ;$ standing by the roadside as the truck approaches, you hear it at $1600 \mathrm{Hz}$. How fast is the truck going?
Recommended Textbooks
University Physics with Modern Physics
Physics: Principles with Applications
Fundamentals of Physics
Transcript
18,000,000+
Students on Numerade
Trusted by students at 8,000+ universities
Watch the video solution with this free unlock.
EMAIL
PASSWORD