need to know the speed of the wave
at the speed of light 300,000,000 m/s
300,000,000 / 20 = 15,000,000 metres
at the speed of sound 333 m/s
333 / 20 = 16.67 metres
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Wavelength = (speed) divided by (frequency) = 10/0.5 = 20
Frequency = (speed)/(wavelength) = 20/2 = 10 Hz
speed = distance over time = wavelength times frequency = 2 m times 10 hz = 20 m hz = 20 meters per second.
Divide the speed by the frequency
Freq = Speed/Wavelength = 37.5/25 Hz = 1.5 Hz