Answer to Question #291388 in Electricity and Magnetism for SelMel

Question

One-meter-long coaxial cable is incorrectly connected to the output device, so part of the signal bounces back on the connection. Determines the speed of the signal along the wire if we see echoes in the signal with a delay of 10 ns. Determines the wavelength of the signal in the cable if its frequency is 10 GHz.

Answer 1

$$c=\dfrac {2L}{t}=2·10^8\text{ m/s}.\\\space\\ \lambda=c/f=0.02\text{ m}.$$