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Physics · Oct / Nov 2019 · Paper 11 · Question 25

5054Electromagnetic spectrum

The frequency of microwaves used in an experiment is 3.0 × 10^9 Hz. Their speed in air is 3.0 × 10^8 m / s. What is a possible frequency and a possible speed in air of a radio wave?

  1. Afrequency / Hz: 3.0 × 10^5; speed in air m / s: 1500
  2. Bfrequency / Hz: 3.0 × 10^5; speed in air m / s: 3.0 × 10^8
  3. Cfrequency / Hz: 3.0 × 10^14; speed in air m / s: 1500
  4. Dfrequency / Hz: 3.0 × 10^14; speed in air m / s: 3.0 × 10^8

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Correct answer: B. frequency / Hz: 3.0 × 10^5; speed in air m / s: 3.0 × 10^8

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