Practice Doppler Effect (C.3.3) - Theme C: Wave Behaviour - IB 12 Diploma Programme Physics

Practice: Doppler Effect

Lesson C.3.3Theme C: Wave Behaviour

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9 questions

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3 questions · about 2 min · pass mark 70%. Hints available.
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6 sample questions

Question 1.
What happens to the frequency of a sound wave if the source moves towards you?
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Think about how the pitch of a siren changes.
Question 2.
What term describes the change in wavelength for an object moving away from an observer?
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Recall the colors of light on the spectrum.
3Question 3.
The Doppler Effect occurs when:
- The source is stationary
- An observer is stationary
- There is relative motion between the source and observer
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Think about what needs to move.
4Question 4.
True or False: The frequency of sound increases when the source is moving away from the observer.
- True
- False
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Recall how pitch changes when an ambulance passes by.
Question 5.
A spaceship travels away from Earth at a speed of 0.1c (where c is the speed of light). If it emits light at a frequency of 600 THz, calculate the observed frequency on Earth. (Use the Doppler formula for light).
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Think about the principles of redshift.
Question 6.
In a medical ultrasound application, a transducer sends sound waves towards a moving blood vessel at 20 m/s. If the source frequency is 2 MHz, calculate the frequency received by the transducer when the blood vessel is moving towards it at 1 m/s.
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Break down the formula with the right values.

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