A progressive wave travels with speed 20 m/s. Two points on the line of propagation are separated by 5 m. If a fixed phase reaches the second point N/4 seconds after reaching the first point, find N.
Physics · Wave Motion · general equation of wave
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Question

A progressive wave travels with speed 20 m/s. Two points on the line of propagation are separated by 5 m. If a fixed phase reaches the second point N/4 seconds after reaching the first point, find N.

G1 Physics · Accepted Answer

The time delay is Δt = Δx/v. Therefore, Δt = 5/20 = 1/4 s. Comparing with N/4 s, we obtain N = 1.