Speed = frequency x wavelength.
200 hertz = 200 waves per second.
These 200 waves will have a speed of 200*300 = 60,000 m/s
The 1000 waves will have the same speed but it will take 5 times longer to travel the 300 metres.
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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.
Frequency = speed / wavelength = 3/0.2 = 15 Hertz
In any substance, all electromagnetic waves travel at the same speed that light travels through that substance.
The speed of a wave = (wavelength) times (frequency) = (10) x (1/2) = 5 meters per second.
It is Hz, which stands for Hertz.