To calculate the speed of the wave, we need to determine the distance traveled by the wave in a given time. In this case, we're given that 10 crests pass by in 1 minute.
The distance between two consecutive crests is referred to as the wavelength (λ). We're told that the crests are 20 m apart, so the wavelength is 20 m.
The formula for calculating the speed (v) of a wave is:
v = λ / T
Where: v = speed of the wave λ = wavelength T = time period
In this case, we need to find the speed of the wave in meters per second (m/s), so we need to convert the time from minutes to seconds. There are 60 seconds in a minute.
T = 1 minute * 60 seconds/minute = 60 seconds
Now, we can substitute the values into the formula:
v = 20 m / 60 s
v ≈ 0.33 m/s
Therefore, the speed of the wave is approximately 0.33 meters per second.