O-LevelPhysicsLight5054/12 · May/June 2018 · Q261 Mark

A communications system uses microwaves with a wavelength of 15 cm. The speed of light is 3.0 × 10⁸ m/s. What is the frequency of the microwaves?

A2.0 × 10⁷ Hz

B4.5 × 10⁷ Hz

C2.0 × 10⁹ Hz

D4.5 × 10⁹ Hz

✓ Correct answer

C: 2.0 × 10⁹ Hz

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