Frequency of the electromagnetic wave \(f=1\,kilo\,cycles\) \(/ s\) \(=1 x 10^3\) cycles \(/ s =10^3\,Hz\)
Velocity of the electromagnetic wave is \(c=3 \times 10^8\,m / s\)
Step2. Find the wavelength of electromagnetic wave:
\(\lambda=\) velocity/frequency
\(=c / f\)
\(=\left(3 \times 10^8\right) / 10^3\)
\(=3 \times 10^5\,m\)
\(=300\,km\)