Question

What is the minimum distance between any two particles of a medium which always have the same speed if a sine wave travels through the medium?

Answer 1

For a sine wave, particles separated by a distance of λ/2 have velocities equal in magnitude but opposite in direction at every instant. Hence, their speeds are always the same.

Therefore, the minimum distance is:

`lambda/2`

where λ is the wavelength of the wave.