Exploring the Doppler Effect and Perceived Frequency

What would you hear if a friend is running towards you while calling your name?

• No sound due to wind resistance

• The actual pitch of their voice

• A lower pitch than the actual sound

• A higher pitch than the actual sound

Tags

NGSS.HS-PS4-1

What do you perceive as the frequency of a sound wave?

• Amplitude

• Wavelength

• Volume

• Pitch

Tags

NGSS.HS-PS4-1

What happens to the pitch of a sound as the source approaches you?

• It decreases

• It remains constant

• It increases

• It becomes inaudible

Tags

NGSS.HS-PS4-1

What does the observer hear if there's no relative motion between the source and the observer?

• A lower frequency

• The actual frequency

• No sound

• A higher frequency

Tags

NGSS.HS-PS4-1

In the Doppler effect equation, what does 'v' represent?

• Volume of sound

• Velocity of the observer

• Velocity of the source

• Velocity of sound

Tags

NGSS.HS-PS4-1

How does the frequency change when the source moves away from the observer?

• Becomes zero

• Increases

• Decreases

• Stays the same

Tags

NGSS.HS-PS4-1

What is the original frequency denoted as in the Doppler effect equations?

• v

• f

• fo

• vs

Tags

NGSS.HS-PS4-1

What is the perceived frequency when the source and observer move towards each other?

• Cannot be determined

• Equal to the actual frequency

• Higher than the actual frequency

• Lower than the actual frequency

Tags

NGSS.HS-PS4-1

What effect does temperature have on the speed of sound?

• Increases it

• No effect

• Decreases it

• Makes it erratic

Tags

NGSS.MS-PS1-4

NGSS.MS-PS4-2

What happens to the pitch of a sound when the source and observer are moving away from each other?

• Stays the same

• Becomes inaudible

• Increases

• Decreases

Tags

NGSS.HS-PS4-1