I want to know how longitudanal waves propagate in the direction parallel to the direction of propagation of wave
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look....longitudinal waves r mechanical waves..n air has vertica layers...so when sound waves travel...the produce kinetic energy which firsts vibrate the first air column then the second n so on...
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Longitudinal waves need medium to travel through.
The particles move back and forth about their mean position (See the pic).
You can visualise it as child playing with a toy car, the kid moves the car back and forth for play, here the kid is applying energy to move the car. Here the kid acts like the energy source, applies energy to the car, which is particle of the medium.
Now see that if the 5 cars move in one line(motion restricted to only one line) but with different speeds, then the first car collide with the second, transfer momentum of it to the second, thus also transferring energy, and the same goes on with the second and third cars, then with the others, creating a chain of collisions, remember that energy is conserved during these collisions(not taking account of friction, as they are analogy of Atomic particles!). Wave is nothing but way in which the energy is propagated.
You can, thus, easily observe that the motion of particles remain periodic motion in the direction of propagation, though they also shake a little in other directions also, but it's average is equivalent to 0 (a little shaking cars!).
Another way to say the above sentence is that particles travel parallel to the line of propagation.
CHECK OUT THIS LINK:
https://youtu.be/2Wlh3M2a10U
The particles move back and forth about their mean position (See the pic).
You can visualise it as child playing with a toy car, the kid moves the car back and forth for play, here the kid is applying energy to move the car. Here the kid acts like the energy source, applies energy to the car, which is particle of the medium.
Now see that if the 5 cars move in one line(motion restricted to only one line) but with different speeds, then the first car collide with the second, transfer momentum of it to the second, thus also transferring energy, and the same goes on with the second and third cars, then with the others, creating a chain of collisions, remember that energy is conserved during these collisions(not taking account of friction, as they are analogy of Atomic particles!). Wave is nothing but way in which the energy is propagated.
You can, thus, easily observe that the motion of particles remain periodic motion in the direction of propagation, though they also shake a little in other directions also, but it's average is equivalent to 0 (a little shaking cars!).
Another way to say the above sentence is that particles travel parallel to the line of propagation.
CHECK OUT THIS LINK:
https://youtu.be/2Wlh3M2a10U
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