80 full waves each with a wavelength of 2 m move past a point in 20secons.

16.1 calculate the frequency of these waves
16.2 calculate the period of these waves
16.3 calculate the speed of these waves

1 answer

16.1 To calculate the frequency of these waves, we use the formula:

Frequency (f) = Number of full waves / Time = 80 / 20 = 4 Hz

Therefore, the frequency of these waves is 4 Hz.

16.2 The period of a wave is the time it takes for one full wave to pass a point. We can calculate it using the formula:

Period (T) = Time / Number of full waves = 20 / 80 = 0.25 s

Therefore, the period of these waves is 0.25 seconds.

16.3 The speed of a wave can be calculated using the formula:

Speed (v) = Frequency (f) x Wavelength (λ)

Since the wavelength is given as 2 m, and we already calculated the frequency to be 4 Hz, we can substitute these values into the formula:

Speed (v) = 4 Hz x 2 m = 8 m/s

Therefore, the speed of these waves is 8 meters per second.