# Wave speed

1. Jan 28, 2008

### sadhu

I have got a trouble with wave concept

suppose wave is passing through a medium ( let it ,just started)

suppose there are four points in the medium (particles)
A,B,C,D

as soon as A is disturbed even by an infinitesimally small distance , B experiences a forces (forces act instantaneously ) . time taken =0;
same happens from B to C
then C to D

time in each case is 0
so net time is 0;

but wave takes some time to reach D, I cant understand why that time gap is coming .as every thing is happening instantly.

2. Jan 28, 2008

### G01

Why are you assuming the force from one particle is instantaneously felt by the next?

The fact is that the force is not instantaneously felt by the second particle.

3. Jan 28, 2008

### timon

if i remember correctly, force is limited at the same speed as light

4. Jan 29, 2008

### sadhu

that means every wave should have a speed of light

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