A-LevelPhysicsWaves9702/12 · Feb/Mar 2016 · Q211 Mark
A distant star is receding from the Earth with a speed of 1.40 × 10⁷ m s⁻¹. It emits light of frequency 4.57 × 10¹⁴ Hz. The speed of light is 3.00 × 10⁸ m s⁻¹. The Doppler effect formula can be used with light waves. What will be the frequency of this light when detected on Earth?
A2.04 × 10¹³ Hz
B4.37 × 10¹⁴ Hz
C4.57 × 10¹⁴ Hz
D4.79 × 10¹⁴ Hz
✓ Correct answer
B: 4.37 × 10¹⁴ Hz
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