NEET Physics EM Spectrum MCQ Question

The wavelength $\lambda$ of an electromagnetic wave is given by $\lambda = \frac{c}{f}$, where $c$ is the speed of light in vacuum ($3 \times 10^8 \text{ m/s}$) and $f$ is the frequency. For $f = 30 \text{ MHz} = 30 \times 10^6 \text{ Hz}$, $\lambda = \frac{3 \times 10^8 \text{ m/s}}{30 \times 10^6 \text{ Hz}} = 10 \text{ m}$.