Question

A bird is sitting on a wooden post in the ocean a short distance offshore. If 2 wave crests pass by the bird every second, and each wave has a length of 2.5 meters, what is the speed of the wave?

a. 0.8 m/s
b. 2 m/s
c. 5 m/s
d. 3 m/s

Answer 1

The answer is C. 5m/s

Explanation:

Wave speed can be calculated using the following formula:

v = f x λ

where v is the wave speed, f is the frequency, and λ is the wavelength.

So, in this example, the wave speed equals

2 waves/second x 2.5 meters = 5 m/s

Answer 2

Answer: Option 'C' is correct.

Explanation:

Since we have given that

Length of each wave = 2.5 meters

Since there are 2 wave crests pass by the bird every second ,

So, Length of two waves is given by

`2.5* 2=5`

As we know the formula for " Speed " :

`Speed=(Distance)/(Time)\\\\Speed=(5)/(1)\\\\Speed=5\ m/s`

Hence, Option 'C' is correct.