Doppler Effect
Physics ⇒ Waves and Sound
Doppler Effect starts at 11 and continues till grade 12.
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See sample questions for grade 11
A police car with its siren on is moving away from you. Will you hear a higher or lower pitch compared to when it is stationary?
Describe one real-life example where the Doppler Effect is used in technology.
Describe the difference between the Doppler Effect for sound and for light.
Describe what happens to the wavelength of sound waves as the source moves towards the observer.
A car horn emits a sound at 600 Hz. The car moves towards a stationary observer at 25 m/s. If the speed of sound is 340 m/s, calculate the frequency heard by the observer.
A police car with its siren on is moving away from you. Will you hear a higher or lower pitch compared to when it is stationary?
A sound source emits a frequency of 400 Hz. If the observer moves towards the source at 20 m/s and the speed of sound is 340 m/s, what is the observed frequency?
A sound source emits at 900 Hz. The observer moves away from the source at 30 m/s, and the speed of sound is 330 m/s. What is the observed frequency?
If both the source and observer are moving towards each other, the observed frequency will be: (1) Lower than the source frequency, (2) Higher than the source frequency, (3) The same as the source frequency, (4) Zero
The Doppler Effect is not observed when: (1) The source and observer are stationary, (2) The source moves at the speed of sound, (3) The observer moves away from the source, (4) The source and observer move towards each other
Which of the following best describes the Doppler Effect? (1) A change in amplitude due to distance, (2) A change in frequency due to relative motion, (3) A change in speed due to temperature, (4) A change in wavelength due to medium
Which of the following factors does NOT affect the Doppler shift? (1) Speed of source, (2) Speed of observer, (3) Amplitude of wave, (4) Speed of wave in medium
A stationary observer hears a higher pitch as an ambulance approaches and a lower pitch as it moves away. This is an example of the ________.
The change in frequency due to the Doppler Effect depends on the ________ between the source and the observer.
The frequency of a sound heard by an observer increases if the source moves ________ the observer.
The observed frequency is lower than the emitted frequency when the source moves ________ from the observer.
True or False: The Doppler Effect can be observed when both the source and observer are moving in the same direction at the same speed.
True or False: The Doppler Effect can be observed with both sound and light waves.
True or False: The Doppler Effect can be used to determine the direction of motion of a star relative to Earth.
True or False: The Doppler Effect can be used to determine the speed of a moving vehicle using radar.
