8.4 & 8.4 Interference & Doppler

What's happening at A?

• Two crests are combining to create constructive interference.

• A crest and a trough are combining to create destructive interference.

• Two crests are combining to create destructive interference.

• A crest and trough are combining to create constructive interference.

Tags

NGSS.HS-PS4-1

What is happening at B?

• Two crests are combining to create constructive interference.

• A crest and a trough are combining to create destructive interference.

• Two crests are combining to create destructive interference.

• A crest and a trough are combining to create constructive interference.

Tags

NGSS.HS-PS4-1

What type of interference do noise cancelling headphones use?

• Constructive Interference

• Destructive Interference

Tags

NGSS.MS-PS4-1

Sound waves in musical instruments or tubes create standing waves that enhance which type of interference to make louder sounds?

• Constructive

• Destructive

Tags

NGSS.HS-PS4-1

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.HS-PS4-1

The high or low pitch of a sound is related to the ___________ of the wave

• decibel
• amplitude
• frequency
• rest position

Tags

NGSS.HS-PS4-1

A car is not moving but the horn is on. You run towards the car to investigate what's going on. As you approach the car, what happens to the frequency of the sound waves from the horn?

• They increase

• They decrease

Tags

NGSS.HS-PS4-1

You are driving in a car and honk the horn at a person standing in the street. As you drive away from 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.

An ambulance is travelling towards a hospital at a constant velocity of 30 m/s.

The diagram above shows the wave fronts of the sound produced from the siren as a result of this motion.

At which side of the diagram, X or Y, is the hospital situated?

• X

• Y

Light can change color due to the Doppler Effect.

• True

• False

Tags

NGSS.HS-PS4-3

NGSS.HS-PS4-4