Why Does Sound from Above the Surface Sound Faint Underwater?

  • Context: High School 
  • Thread starter Thread starter p834
  • Start date Start date
  • Tags Tags
    Sound Underwater
Click For Summary
SUMMARY

Sound from above the surface sounds faint underwater due to several factors. Sound waves are partially reflected at the water's surface, and the transition from air to water results in inefficient energy transfer, leading to minimal excitation of pressure waves in water. Additionally, the pressure on the eardrums underwater reduces sensitivity to sound. Understanding these principles clarifies why underwater acoustics differ significantly from those in air.

PREREQUISITES
  • Understanding of sound wave propagation in different mediums
  • Basic knowledge of pressure dynamics in fluids
  • Familiarity with acoustic properties of water and air
  • Awareness of the physics of sound reflection
NEXT STEPS
  • Research the physics of sound wave propagation in various mediums
  • Explore the concept of acoustic impedance and its effects on sound transmission
  • Learn about the principles of sound reflection and refraction at interfaces
  • Investigate underwater acoustics and its applications in marine biology
USEFUL FOR

Students of physics, marine biologists, audio engineers, and anyone interested in the principles of sound propagation in different environments.

p834
Messages
3
Reaction score
0
When swimming underwater, why does sound from above the surface sound very faint?

I know that the answer to this may be simple, but I just can't put my finger on the answer. I know that sound travels faster in water then it does in air, does this fact have anything to do with it?

Thanks!
 
Physics news on Phys.org
Sound is partially reflected at the surface. Your ear-drums are under pressure, thus probably less sensitive.
 
A.T. above is correct: sound waves are partially reflected from the surface of the water. Also, sound waves in air do not pass into water efficiently. The energy of those waves is so small it is not sufficient to excite pressure waves in water easily. So when you are underwater you will hear very little sound from the surrounding air.

Sound waves propagate through the mediums of gas, liquids, solids, and plasmas. Sound waves in air (gas) form a series of pressure highs and lows. To see good graphical diagrams of these pressure waves see:

http://hyperphysics.phy-astr.gsu.edu/hbase/sound/tralon.html
 

Similar threads

Undergrad Sound underwater distance and decibels
  • · Replies 2 ·
Replies
2
Views
2K
High School What sound frequencies can pass through a hole in a wall?
  • · Replies 31 ·
2
Replies
31
Views
5K
High School About actually touching something and sound made by collision
  • · Replies 10 ·
Replies
10
Views
2K
High School Speed of sound in steel vs air
  • · Replies 7 ·
Replies
7
Views
3K
Graduate Breaking the sound barrier underwater?
  • · Replies 8 ·
Replies
8
Views
10K
Undergrad A Question about Sound Waves Propagating Through a Large Metal Cube
  • · Replies 10 ·
Replies
10
Views
3K
Undergrad Can someone explain the vacuum pressure created by water pressure on waders?
  • · Replies 9 ·
Replies
9
Views
5K
Undergrad How Does Air Resistance Relate to Hooke's Law?
  • · Replies 13 ·
Replies
13
Views
3K
Graduate Sound: How pleasing to the ear
  • · Replies 6 ·
Replies
6
Views
2K
Undergrad Sound Wave Attenuation: Why Does Water Attenuate More?
  • · Replies 4 ·
Replies
4
Views
6K