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What is the frequency of an electromagnetic wave if its wavelength is $\lambda = 3 \text{ m}$ and it travels at the speed of light $c = 3 \times 10^8 \text{ m/s}$?
- A.$10^7 \text{ Hz}$
- B.$10^8 \text{ Hz}$
- C.$3 \times 10^8 \text{ Hz}$
- D.$9 \times 10^8 \text{ Hz}$
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Correct answer: B — $10^8 \text{ Hz}$
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