How Long After a Crash Does Sound Reach Different Observers?

Click For Summary
SUMMARY

The discussion centers on calculating the time it takes for sound to reach different observers after a crash occurs. Given that the speed of sound in water is 1450 m/s and in air is 346 m/s, the problem involves determining the time difference between when a swimmer underwater hears the crash and when a friend on the dock hears it. The solution requires applying the formula t = d/v, where d is the distance and v is the speed of sound in the respective medium. The key conclusion is that the time difference can be calculated by establishing the distance to the crash site and applying the respective speeds of sound.

PREREQUISITES
  • Understanding of sound propagation in different media
  • Knowledge of the speed of sound in water (1450 m/s) and air (346 m/s)
  • Familiarity with basic physics equations, particularly t = d/v
  • Ability to interpret and analyze physics problems
NEXT STEPS
  • Research the effects of temperature on the speed of sound in air and water
  • Learn about sound wave propagation and its applications in underwater acoustics
  • Explore real-world scenarios involving sound transmission in different environments
  • Study advanced physics problems involving multiple observers and sound delay calculations
USEFUL FOR

This discussion is beneficial for physics students, educators, and anyone interested in understanding sound propagation in various media, particularly in scenarios involving multiple observers at different locations.

dlre
Messages
6
Reaction score
0

Homework Statement



the air temperature is 20 degree celsius. you are swimming underwater when you hear a boat noise. then 305s later, you hear a crash. if the speed of sound in wter is 1450m/s, how long after the crash does your friend on the dock beside oyu hear the crash?

Homework Equations



??

The Attempt at a Solution



??
 
Physics news on Phys.org
Do you know the speed of sound in air?
 
346m/s?
 
Ok so you know the time it takes for the sound to transverse a distance in a certain medium is t = \frac{d}{{v_{medium} }}. You really don't know the "distance" because it's not actually stated in the problem that the crash occurred immediately after the boat sound is heard but you CAN determine the ratio of the time sound waves take to reach each person using the equation.
 

Similar threads

Replies
20
Views
5K
Replies
3
Views
4K
Replies
3
Views
2K
  • · Replies 21 ·
Replies
21
Views
2K
  • · Replies 7 ·
Replies
7
Views
5K
Replies
7
Views
2K
  • · Replies 8 ·
Replies
8
Views
4K
  • · Replies 4 ·
Replies
4
Views
1K
Replies
16
Views
3K
Replies
14
Views
6K