Lesson: Chapter 4 — Waves and their applications

4.2. Electromagnetic waves 4 of 4 Reset answers

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Question 4

A radio wave has a frequency of 1 × 10⁸ Hz. What is its wavelength?

A 3 × 10¹⁶ m B 0.3 m C 30 m D 3 m

The right answer is the one marked above.

3 m. λ = c ÷ f = 3 × 10⁸ ÷ 1 × 10⁸ = 3 m.

Multiplying c by f instead of dividing gives the enormous 3 × 10¹⁶.

Answer the question to continue.