There is no uniform frequency - different meters in different countries have different frequencies.
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Wavelength = (speed) / (frequency) =(299,792,458) / (1,240,000) = 241.768 meters
Frequency (1/seconds) x Wave Length (meters) = Speed (meters/sec. or m/s)
Wavelength = speed/frequency = 30/10 = 3 meters
Frequency = (speed) / (wavelength) = 900/9 = 100 Hz.
Wavelength x frequency = speed of the wave, so wavelength = speed / frequency. In SI units, wavelength (in meters) = speed (in meters/second) / frequency (in Hertz). If you are talking about electromagnetic waves in avacuum, use 300,000,000 m/s for the speed.