Question
Susie hammers on a block of wood when she is $85 \mathrm{~m}$ from a large brick wall. Each time she hits the block, she hears an echo $0.5 \mathrm{~s}$ later. With this information, show that the speed of sound is $340 \mathrm{~m} / \mathrm{s}$.
Step 1
The sound wave travels from Susie to the wall and then back to Susie, so the total distance traveled by the sound wave is $2 \times 85 \mathrm{~m} = 170 \mathrm{~m}$. Show more…
Show all steps
Your feedback will help us improve your experience
Eric Mockensturm and 50 other 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
You warch distant Sally Homemaker driving nails into a front porch at a regular rate of 1 stroke per second. You hear the sound of the blows exactly synchronized with the blows you see. And then you hear one more blow after you see the hammering stop. Explain how you calculate that Sally is 340 $\mathrm{m}$ away from you.
Three seconds after a gun is fired, the person who fired the gun hears an echo. How far away was the surface that reflected the sound of the shot? Use $340 \mathrm{~m} / \mathrm{s}$ for the speed of sound.
A source of sound moves toward you at speed $v_{\mathrm{s}}$ and away from Jane, who is standing on the other side of it. You hear the sound at twice the frequency as Jane. What is the speed of the source? Assume that the speed of sound is $340 \mathrm{~m} / \mathrm{s}$.
Transcript
Watch the video solution with this free unlock.
EMAIL
PASSWORD