Doppler Effect

Physics ⇒ Waves and Sound

Doppler Effect starts at 11 and continues till grade 12. QuestionsToday has an evolving set of questions to continuously challenge students so that their knowledge grows in Doppler Effect. How you perform is determined by your score and the time you take. When you play a quiz, your answers are evaluated in concept instead of actual words and definitions used.

See sample questions for grade 12

Describe the difference between the Doppler Effect for sound and for light.

Describe what is meant by 'redshift' and 'blueshift' in the context of the Doppler Effect for light.

Explain why the Doppler Effect is important in medical imaging.

Explain why the Doppler Effect is not observed when the source and observer are stationary relative to each other.

A car is moving at 20 m/s towards a stationary observer. The car's horn emits a sound at 440 Hz. The speed of sound is 340 m/s. What frequency does the observer hear?

A police car is moving towards a stationary observer at 40 m/s, emitting a siren at 600 Hz. The speed of sound is 340 m/s. What is the observed frequency?

A sound source moves away from a stationary observer at 25 m/s. The speed of sound is 340 m/s and the source frequency is 700 Hz. What is the observed frequency?

A source emits sound at 1000 Hz. An observer moves towards the source at 30 m/s. The speed of sound is 330 m/s. What is the observed frequency?

Which of the following best describes the observed frequency when a sound source moves towards a stationary observer? (1) The frequency increases (2) The frequency decreases (3) The frequency remains the same (4) The frequency becomes zero

Which of the following equations represents the observed frequency when both the source and observer are moving? (1) \( f' = f \frac{v + v_o}{v - v_s} \) (2) \( f' = f \frac{v - v_o}{v + v_s} \) (3) \( f' = f \frac{v}{v + v_s} \) (4) \( f' = f \frac{v - v_s}{v + v_o} \)

Which of the following factors does NOT affect the magnitude of the Doppler shift? (1) Speed of the source (2) Speed of the observer (3) Amplitude of the wave (4) Speed of the wave in the medium

Which of the following is an example of the Doppler Effect in astronomy? (1) The twinkling of stars (2) The redshift of distant galaxies (3) The phases of the moon (4) The solar eclipse

Fill in the blank: The change in frequency due to the Doppler Effect is _______ when the source and observer move away from each other.

Fill in the blank: The Doppler Effect causes the wavelength of a wave to _______ when the source moves towards the observer.

Fill in the blank: The observed frequency is _______ when the observer moves away from a stationary source.

If both the source and observer are moving towards each other, the observed frequency will be _______ than the source frequency.

The Doppler Effect is only observed when there is relative motion between the source and the observer. (True/False)

True or False: The Doppler Effect can be used to determine the speed of a moving object.

True or False: The Doppler Effect can be used to measure the rotation speed of stars.

True or False: The Doppler Effect can occur with all types of waves, including sound, light, and water waves.