5. Waves and Sound

Doppler Effect — Quiz

Test your understanding of doppler effect with 5 practice questions.

Practice Questions

Question 1

A stationary sound source emits a frequency of $f_s$. An observer moves away from the source at a speed of $v_o$. If the speed of sound in the medium is $v$, which of the following expressions correctly represents the observed frequency $(f_o)$?

Question 2

A sound source is moving towards a stationary observer at a speed of $v_s$. If the source emits a frequency of $f_s$ and the speed of sound in the medium is $v$, which of the following expressions correctly represents the observed frequency $(f_o)$?

Question 3

A car horn emits a sound with a frequency of $440 \text{ Hz}$. If the car is moving towards a stationary observer at $25 \text{ m/s}$, and the speed of sound in air is $340 \text{ m/s}$, what is the approximate observed frequency?

Question 4

A train whistle emits a sound with a frequency of $500 \text{ Hz}$. If the train is moving away from a stationary observer at a speed of $30 \text{ m/s}$, and the speed of sound in air is $340 \text{ m/s}$, what is the approximate observed frequency?

Question 5

An observer is moving towards a stationary sound source at a speed of $20 \text{ m/s}$. The source emits a frequency of $600 \text{ Hz}$. If the speed of sound in air is $340 \text{ m/s}$, what is the approximate observed frequency?