the answer to your question is called the frequency
Crests and troughs are both characteristic features of waves. A crest is the point on a wave with the maximum positive amplitude, while a trough is the point with the maximum negative amplitude. Together, they represent the maximum and minimum points of a wave's oscillation.
The time between the passage of two wave crests or troughs at a fixed point is known as the period of the wave. It is measured in seconds and is inversely related to the frequency of the wave.
A wave can be described by its wavelength (distance between two consecutive crests or troughs), frequency (number of crests passing a fixed point per unit of time), and amplitude (maximum displacement of a wave from its rest position).
The number of wave crests passing a given place in one second is the frequency of the wave given in cycles per second, or Hertz.
The three parts of a wave are the crest (the highest point of the wave), the trough (the lowest point of the wave), and the wavelength (the distance between two consecutive crests or troughs).
That is twice the frequency. Frequency is equal to the number of complete cycles which pass a point per second.
Crests and troughs are both characteristic features of waves. A crest is the point on a wave with the maximum positive amplitude, while a trough is the point with the maximum negative amplitude. Together, they represent the maximum and minimum points of a wave's oscillation.
The time between the passage of two wave crests or troughs at a fixed point is known as the period of the wave. It is measured in seconds and is inversely related to the frequency of the wave.
Frequency
A wave can be described by its wavelength (distance between two consecutive crests or troughs), frequency (number of crests passing a fixed point per unit of time), and amplitude (maximum displacement of a wave from its rest position).
it depends on what you are talking about if your talking about light here it is light can be classified as a wave when your talking about crests and troughs a crest is the top most part of the wave if you split the wave in half the trough has the same principle it is the lowest most part of the wave if you split it in half does that clarrify a little bit?
The wavelength is the horizontal distance between the crests or troughs of two successive waves.
The number of crests that pass a fixed point in a one-second time interval is called the "frequency" of the wave. It's also equal to the (speed of the wave) divided by the (wavelength)
The number of wave crests passing a given place in one second is the frequency of the wave given in cycles per second, or Hertz.
The three parts of a wave are the crest (the highest point of the wave), the trough (the lowest point of the wave), and the wavelength (the distance between two consecutive crests or troughs).
A long narrow depression between waves is known as a trough. It is the lowest point of a wave where the water level is at its lowest. Troughs are followed by wave crests, the highest points in a wave.
Wavelength is the distance between two consecutive crests (or troughs) of a wave. The frequency of a wave determines how many wavelengths pass a point in a given amount of time. The more waves that pass by a point in a second, the higher the frequency.