Question
Question: An observer standing at the seacoast observes 54 waves reaching the coast per minute. If the wavelen...
An observer standing at the seacoast observes 54 waves reaching the coast per minute. If the wavelength of the waves is 10 m, its velocity is –
A
90 m/s
B
90 cm/s
C
9 m/s
D
900 m/s
Answer
9 m/s
Explanation
Solution
Frequency of waves n = 
per second
l = 10 m
\ v = nl
= 
× 10 = 9 m/sec.