A crest of a water wave requires 5.2 s to travel between two points on a fishing pier located 19 m apart. It is noted in a series of waves that 20 crests pass the first point in 17 s. What is the wavelength of the waves?
I know the steps required to solve the problem. My question is: why is 20 crests considered 20 waves? I thought that 1 wavelength = distance from crest to crest. So, why isn't the answer 10 waves? PLEASE help!
I know the steps required to solve the problem. My question is: why is 20 crests considered 20 waves? I thought that 1 wavelength = distance from crest to crest. So, why isn't the answer 10 waves? PLEASE help!
1 Answer
Here is what I think
Explanation:
It has been given that the water wave travels 19 m in 5.2s.
Hence velocity of the water wave is
It is also given that 20 crests pass the first point in 17s.
The distance in between two consecutive crests are known as wave length. So 20 crests in a row will be composed of 19 waves.
As 20 crests pass the first point in 17 sec then distance traveled by the wave in 17s will be
So this will be length of 19 waves.
Hence wave length