pitch is the perceived frequency of a sound wave.
A high tide means when the water has risen and is higher up(closer to high up land). Low tide is when it’s receded
The answer is definitely C.) their molecules move at the same average speed
Answer:
Fluorine is the most reactive element
The refractive index of water is

. This means that the speed of the light in the water is:

The relationship between frequency f and wavelength

of a wave is given by:

where v is the speed of the wave in the medium. The frequency of the light does not change when it moves from one medium to the other one, so we can compute the ratio between the wavelength of the light in water

to that in air

as

where v is the speed of light in water and c is the speed of light in air. Re-arranging this formula and by using

, we find

which is the wavelength of light in water.