You generate a wave in a spring, stretched out on the floor, by oscillating your hand back and forth at a frequency of 1.6 Hz. The wave has a 1.5-m wavelength. If the wave takes 2.9 s to travel to the other end of the spring and back to your hand, what is the length of the stretched spring?

Answer 1

f=1.6 Hz
λ=1.5 m
v= λf=1.5•1.6=2.4 m/s
L=vt/2=2.4•2.9/2=3.48 m.