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Tutorial ID | Title | Tutorial | Video Tutorial | Revision Notes | Revision Questions | |
---|---|---|---|---|---|---|
12.7 | The Doppler Effect |
1. An ambulance car normally emits a sound wave of frequency 1500 Hz. A girl hears a 1560 Hz siren from such a car. How is the ambulance car moving? Take the speed of light in air equal to 343 m/s.
Correct Answer: B
2. Two identical airplanes are approaching each other at equal speeds. Each of them emits a sound of frequency equal to 2000 Hz when at rest. What is the flying speed of each airplane if pilots hear a 4000 Hz sound wave emitted by the other airplane? Take the speed of sound in air equal to 343 m/s.
Correct Answer: D
3. A star is moving away from our galaxy at 0.2 × c where c = 3 × 108 m/s is the speed of light in vacuum. As a result, the frequency of light it emits appears to be 4.3 × 1014 Hz (red light). What is the frequency of the original light emitted by the star?
Correct Answer: D
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