Question

In watching a transverse wave go by, a woman notes that 20 crests go by in a time of 7.6 s. If she measures the distance between two successive crests to be 0.6 m and if the first and the last points that pass her are crests, what is the speed of the wave?

A) 0.24 m/s

B) 0.4 m/s

C) 8.0 x 10^-2 m/s

D) 1.5 m/s

Answer 1

Distance between 20 successive creates (d) = 19 x 0.6 = 11.4 meter

Time (t) = 7.6 seconds

Speed of wave (v) = distance/time

v = 11.4/7.6

Speeed of wave (v) = 1.5 m/s

Option (D) is correct