# Sound waves

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??

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

Doug Huffman
Gold Member

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.

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.

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

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

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

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

Huygens' Principle states that from every point on the wave front there is sound going in all directions.

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..??

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]

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well thanks buddy...!!!@