Discussion
A radio can tune in to any station in the 7.5 MHz to 12 MHz band. The corresponding wavelength band is
Answer: C
The wavelength band is 40m-25m.
\(\lambda = \frac{c}{f}\) with \(c = 3 \times 10^{8}\) m/s:
\[ \begin{aligned} \lambda_{1} &= \frac{3 \times 10^{8}}{7.5 \times 10^{6}} = 40\ \text{m} \\ \lambda_{2} &= \frac{3 \times 10^{8}}{12 \times 10^{6}} = 25\ \text{m} \end{aligned} \]
Higher frequency means shorter wavelength, so the band runs from 40 m down to 25 m.
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