The speed of light is a constant so even if the problem does not provide you with a value the value remains 300 x 108 ms. Radio waves travel at the speed of light so in this case v is equal to 299792458 metres per second ms and 245 GHz is 2450000000 Hz so thats the frequency. F C l 300 x 108 573 x 10-7 524 x 1014.
Where c is the speed of light and l l is the given wavelength.
Calculating Wavelength Given Speed and Frequency 1. It is inversely proportional to the frequency of the wave if we assume that the wave is moving at a fixed speed. Speed can be represented using both metric and imperial units. For example f 10 MHz.