The Doppler Effect with Sound (Grade 12 NSC Matric Physical Sciences): Quizzes
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Practise the questions
10 questions from this quiz
What is the Doppler effect?
What is the Doppler effect?
Change in observed frequency due to motion
What happens to the pitch of an ambulance siren as it approaches you?
What happens to the pitch of an ambulance siren as it approaches you?
Pitch becomes higher
What happens to wave crests in front of a moving sound source?
What happens to wave crests in front of a moving sound source?
They become bunched together
In the Doppler formula, what is the sign of when the source moves towards the listener?
In the Doppler formula, what is the sign of when the source moves towards the listener?
Negative
What is the sign of when the listener moves away from the source?
What is the sign of when the listener moves away from the source?
Negative
What does an observer moving towards a stationary source encounter?
What does an observer moving towards a stationary source encounter?
More wave crests per unit time
What is the frequency range for ultrasound waves?
What is the frequency range for ultrasound waves?
Greater than 20,000 Hz
What does medical ultrasound primarily examine using the Doppler effect?
What does medical ultrasound primarily examine using the Doppler effect?
Blood flow in the body
What does the frequency shift in medical Doppler indicate?
What does the frequency shift in medical Doppler indicate?
Blood flow speed and direction
An ambulance at 700 Hz moves at 20 m/s towards you. What frequency do you hear? ( = 340 m/s)
An ambulance at 700 Hz moves at 20 m/s towards you. What frequency do you hear? ( = 340 m/s)
743.75 Hz