Exploring the Doppler Effect in Sound Waves

What phenomenon explains the change in pitch of an ambulance siren as it passes by?

• Doppler Effect

• Reflection

• Refraction

• Interference

Tags

NGSS.HS-PS4-1

Who is credited with the discovery of the Doppler Effect?

• Galileo Galilei

• Christian Doppler

• Albert Einstein

• Isaac Newton

In the case of a stationary source and a moving observer, if the observer is moving towards the source, what happens to the apparent frequency?

• It fluctuates

• It increases

• It remains the same

• It decreases

Tags

NGSS.HS-PS4-1

What is the formula for the apparent frequency when the observer is moving away from a stationary source?

• F' = (V + Vo) / V * F

• F' = V / (V + Vo) * F

• F' = (V - Vo) / V * F

• F' = V / (V - Vo) * F

Tags

NGSS.HS-PS4-1

NGSS.HS-PS4-3

When a moving source approaches a stationary observer, what happens to the wavelength of the sound waves?

• It fluctuates

• It remains the same

• It increases

• It decreases

Tags

NGSS.HS-PS4-1

If a source is moving away from a stationary observer, what is the formula for the apparent frequency?

• F' = F * (V + Vs) / V

• F' = F * (V - Vs) / V

• F' = F * V / (V - Vs)

• F' = F * V / (V + Vs)

Tags

NGSS.HS-PS4-1

NGSS.HS-PS4-5

In the case where both the source and observer are moving in the same direction, what is the relative velocity of the sound wave approaching the observer?

• V + Vs

• V - Vo

• V + Vo

• V - Vs

Tags

NGSS.HS-PS4-1

What is the general formula for finding the apparent frequency heard by a moving observer due to a moving source?

• F' = F * (V - Vo) / (V + Vs)

• F' = F * (V ± Vs) / (V ± Vo)

• F' = F * (V + Vo) / (V - Vs)

• F' = F * (V ± Vo) / (V ± Vs)

Tags

NGSS.HS-PS4-1

NGSS.HS-PS4-5

In the example problem, what is the frequency heard by the observer when the train approaches?

• 941.18 Hz

• 1066.67 Hz

• 1000 Hz

• 1200 Hz

Tags

NGSS.HS-PS4-1

What is the percentage change in frequency heard by the observer as the train passes by in the example problem?

• 6%

• 12%

• 18%

• 24%

Tags

NGSS.HS-PS4-1