# Sound waves

1. Feb 7, 2010

### champ_9999

if a person speak something , the person just behind him is able to listen to that sound.

so how does this disturbance travelled to the later persons??

2. Feb 7, 2010

### Pythagorean

That's the thing about waves. They propagate around corners.

3. Feb 7, 2010

### Doug Huffman

4. Feb 7, 2010

Speech is an over/under pressure in the mouth. It starts as a circular wave in the mouth traveling around objects like the water ripples in a pond do.

5. Feb 7, 2010

### Stonebridge

What all the others have said; plus...
The typical wavelength of sounds, in air, in the vocal range is about 1 metre. This is significantly larger than the size of the obstacle (your head), and results in the waves tending to bend around it.

6. Feb 8, 2010

### champ_9999

but what if we r in an open ground then from where it would reflect

7. Feb 8, 2010

### champ_9999

do u mean to say they bends as soon as they leave our mouth

8. Feb 8, 2010

### champ_9999

what if we r shouting through a 1 merte long pipe in an open ground

so can the wave bend around the other end of the pipe through 180 degrees?

or the wave can travel through our head??

9. Feb 8, 2010

10. Feb 9, 2010

### champ_9999

so u mean to say
there exist secondary wavelets in soundwaves..??

so can u just explain me the funda of secondary wavelets ,,, i mean in which types of waves secondary wavelets exists like in sound waves or in string waves or some other kind of waves..??

11. Feb 9, 2010

These "wavelets" exist in all waves. Strings are one dimensional though, so the wave is the same as the wavelet. In a way the primary wave consist of the secondary ones, it is not one starting the other.
But anyways this is just the rough principle to get deeper you have to solve the wave equation or look at experiments.

Here is a link with some pictures of waves hitting an obstacle (number 4):
http://www.dieter-heidorn.de/Physik/LK_AG/SchwingungenWellen/K3_MechanischeWellen/K33_Huygens/K33_Huygens.html [Broken]

Last edited by a moderator: May 4, 2017
12. Feb 12, 2010

### champ_9999

well thanks buddy...!!!@