O-LevelPhysicsLight5054/12 · Oct/Nov 2021 · Q271 Mark
A satellite orbits the Earth at a height of 300 km above the surface. The speed of electromagnetic waves is 3.0 × 10⁸ m/s. What is the minimum time taken for a radio signal transmitted from the Earth to reach the satellite?
A1.0 × 10⁻⁶ s
B2.0 × 10⁻⁶ s
C1.0 × 10⁻³ s
D2.0 × 10⁻³ s
✓ Correct answer
C: 1.0 × 10⁻³ s
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