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how to find out wave frequency. Wave frequency can be measured by counting the number of crests high points of waves that pass the fixed point in 1 second or some other time period. 1 cycle 1 full wave to repeat itself.
Waves may be graphed as a function of time or distance. From the distance graph the wavelength may be determined. You can also calculate how long it takes sound to travel a given distance or how far sound will travel within a given time span.
Choose the waves velocity.
From both together the wave speed can be determined. T is the time it takes for one complete oscillation it is measured in seconds. You can also calculate how long it takes sound to travel a given distance or how far sound will travel within a given time span. If the wavelength is given in nanometers you need to convert this value into meters by dividing.