The pitch of a sound wave relates to the wave's _________________.

• Amplitude

• Frequency

• Wavelength

• Period

An ambulance is driving towards you as you stand on the sidewalk. What happens to the pitch of the siren as it comes towards you?

• It increases

• It decreases

What is the Doppler Effect?

• A change in frequency due to the relative motion of a wave source and an observer

• When a wave overlaps with another wave

• When a wave bounces off of another object

• When a wave bends due to traveling through a different medium

Tags

NGSS.MS-PS4-1

NGSS.MS-PS4-2

You are driving in a car and honk the horn at a person standing in the street. As you approach the person, what happens to the pitch of the horn according to you in the car?

• It increases

• It decreases

• It stays the same because you are in the car moving with the sound.

Tags

NGSS.MS-PS4-1

You are standing on the side of the road when a police car races past you with its siren on. After the police car passes you, what happens to the pitch of the siren?

• It increases

• It decreases

• It turns red

Tags

NGSS.MS-PS4-2

Look at the picture. Who is experiencing a higher pitched sound?

• Observer A

• Observer B

• There's no difference

Tags

NGSS.MS-PS4-1

NGSS.MS-PS4-2

What can you tell about the motion of this object?

• Moving left.
• Moving right quickly.
• Standing still. 
• Moving up slowly. 

Tags

NGSS.MS-PS2-2

In this clip, the sound of the jet illustrates the doppler effect AS OBSERVED BY

• The man on the ground

• The pilot in the jet

• Both the man on the ground and the pilot in the jet

Tags

NGSS.MS-PS4-1

NGSS.MS-PS4-2

The car below emits sound waves, represented by red circles, that are heard by an observer. Based on the pattern of sound waves, what is the direction and speed of the car?

• toward the observer, faster than the speed of sound

• toward the observer, slower than the speed of sound

• away from the observer, faster than the speed of sound

• away from the observer, slower than the speed of sound

Tags

NGSS.MS-PS2-1

NGSS.MS-PS4-1

Do Now: Match the term to the definition:

d

c

b

a

Crest

Amplitude

Wavelength

Trough

Tags

NGSS.MS-PS4-1