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Physics · Oct / Nov 2021 · Paper 12 · Question 27

5054Electromagnetic spectrum

A satellite orbits the Earth at a height of 300 km above the surface. The speed of electromagnetic waves is 3.0 × 10^8 m / s. What is the minimum time taken for a radio signal transmitted from the Earth to reach the satellite?

  1. A1.0 × 10^–6 s
  2. B2.0 × 10^–6 s
  3. C1.0 × 10^–3 s
  4. D2.0 × 10^–3 s

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Correct answer: C. 1.0 × 10^–3 s

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