The unit "Hz" is short for hertz, named after the German physicist Heinrich Hertz (1857 – 94). The Amplitude is the height from the center line to the peak (or to the trough). A single frequency wave will appear as a sine wave (sinosoid) in either case. From the time graph, the period and frequency can be obtained. If you know the speed and frequency of the wave, you can use the basic formula for wavelength. Wavelength is the distance of 1 frequency wave peak to the other and is most commonly associated with the electromagnetic spectrum. From the distance graph the wavelength may be determined. The lowest frequency mode for a stretched string is called the fundamental, and its frequency is given by. Note that the angular frequency of the second wave is twice the frequency of the first wave (2$$\omega$$), and since the velocity of the two waves are the same, the wave number of the second wave is twice that of the first wave (2k). Electromagnetic waves travel at the speed of light (299,792,458 meters per second) and their frequency and wavelength can be determined by the formulas: where 'c' is the speed of light in meters per second, the Greek letter lambda λ is the wavelength in meters and the frequency is in cycles per second. Calculating wavelength is dependent upon the information you are given. The Period goes from one peak to the next (or from any point to the next matching point):. From. The frequency of a wave is measured as the number of complete back-and-forth vibrations of a particle of the medium per unit of time. The period can be seen from the graph as and the frequency equals .. When the wave relationship is applied to a stretched string, it is seen that resonant standing wave modes are produced. The formula for the frequency of the note we will hear is… Do you notice a pattern forming in the formulas? Some functions (like Sine and Cosine) repeat forever and are called Periodic Functions.. The "cycles" can be movements of anything with periodic motion, like a spring, a pendulum, something spinning, or a wave. Waves may be graphed as a function of time or distance. The frequency, f, of a wave is the number of times a wave's crests pass a point in a second.If you watch a water wave in the bath pass over one of your toes twice every second the frequency of the wave is 2 Hz. What are the period and frequency of y = ? Or we can measure the height from highest to lowest points and divide that by 2. ; Using the formula we have period = .This graph shown below uses the WINDOW X: (-2, 4, 1) and Y: (-2, 2, 1).. Notice that there are three complete waves in a distance along the x-axis of [4 - (-2)] = 6. Amplitude, Period, Phase Shift and Frequency. Hopefully, because for both open and closed end pipes, we will only give you the formulas for the fundamentals lengths. 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