Doppler Effect Review Lesson

Doppler Effect Review Lesson

2022-23

​Doppler Effect

​The apparent change in frequency due to the relative motion of the source (or receiver) is called the Doppler effect.

​

​As a result of the change in frequency, the pitch of the sound produced is impacted.

​

​Frequency is same at A and B

​Shorter wavelength=

higher frequency

​Longer wavelength=

​Lower frequency

Multiple Choice

What can you tell about this object's motion?

• Moving to the North (up).

• Moving to the South (down). 

• Moving to the West (left). 

• Moving to the East (right). 

Multiple Choice

What can you tell about the motion of this object?

• Moving left.

• Moving right quickly.

• Standing still. 

• Moving up slowly. 

Multiple Choice

The vast majority of galaxies in our universe are moving away from us.  We know this because we observe __________ in the galaxies absorption spectra.

• Redshift

• Blueshift

• Turbulance

• Superposition

Multiple Choice

If a star is being observed from Earth and it's light has shifted towards the blue side of the electromagnetic spectrum it would be...

• Moving towards the Earth

• Moving away from the Earth

• This is a trick question that cannot be answered

• It isn't a star, it is a very large blueberry.

Multiple Choice

What best describes the doppler effect?

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

• When sound changes pitch

• When light changes color

• An apparent change in the amplitude of a wave due to the relative motion between a wave source and an observer.

Multiple Choice

The Doppler effect is seen when a wave-making source moves toward an observer. 

• True

• False

Multiple Choice

When an ambulance move TOWARD you it sounds ________ pitched. 

• high

• low

• medium

Multiple Choice

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

• Amplitude

• Frequency

• Wavelength

• Period

Multiple Choice

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

Multiple Choice

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

Multiple Choice

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

• Observer A

• Observer B

• There's no difference