Why Does Sound from Above the Surface Sound Faint Underwater?

In summary, when swimming underwater, sound from above the surface sounds very faint because it is partially reflected at the surface and sound waves do not pass into water efficiently. This is due to the difference in the mediums of gas and liquid and the formation of pressure waves.
  • #1
p834
4
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!
 
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  • #2
Sound is partially reflected at the surface. Your ear-drums are under pressure, thus probably less sensitive.
 
  • #3
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
 

1. Why does sound from above the surface sound faint underwater?

Sound travels differently through water than it does through air. In water, sound waves are able to travel much faster due to the higher density of water. This causes sounds from above the surface to become distorted and faint when heard underwater.

2. Does the depth of the water affect how faint the sound is?

Yes, the deeper the water, the fainter the sound will be. This is because as sound waves travel through water, they lose energy and become weaker. The deeper the water, the more energy is lost and the fainter the sound becomes.

3. Can sound be heard clearly underwater?

While sound from above the surface may sound faint underwater, there are certain factors that can affect how clearly it can be heard. For example, the clarity of the water, the distance from the source of the sound, and the frequency of the sound can all impact how clearly it can be heard.

4. Why do some sounds sound clearer underwater than others?

Some sounds, such as low frequency sounds, are able to travel further underwater and can be heard more clearly. This is because low frequency waves have longer wavelengths and are less affected by the density of water. On the other hand, high frequency sounds are quickly absorbed by water and may sound muffled or faint underwater.

5. Is it possible to amplify or enhance sound underwater?

Yes, it is possible to amplify or enhance sound underwater through the use of specialized technology and equipment such as underwater speakers. These devices are designed to emit sound waves at specific frequencies that are able to travel further and be heard more clearly underwater.

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