Question

four students A,B,C,and D in a group take 6 m long slink and produce a longitudinal wave they observe that in 10s 4 wave completed on These observation the speed of wave in slink is (a)4.8m/s (b)6.4m/s(c)7.2m/s (d)9.6m/s

Answer 1

I think answer is a or d