First slide

Electromagnetic radiation and spectra

Question

FM radio broadcasts at 900 kHz. The wavelength it corresponds to is__meter ?
Round off to nearest integer.

Moderate

Solution

$\begin{array}{l} v = \frac{c}{λ} \\ ∴ λ = \frac{c}{v} = \frac{3 .0 \times 10^{8} {ms}^{- 1}}{900 \times 10^{3} s^{- 1}} \\ = 333 m \end{array}$

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