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A formula that you need to be familiar with here is...
Speed = Frequency x Wavelength
Where speed is measured in meters per second, frequency is measured in Hertz, and wavelength is measured in meters.
The speed of the wave as given in your problem is 3 x 10^8 m/s. If the wave has a frequency of 5 x 10^5 Hz we can then substitute these values in the appropriate place in the formula.
3 x 10^8 = (5 x 10^5) x (wavelength)
To solve, we can divide both sides by 5 x 10^5
This will give us a wavelength of 600 meters. | 
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