Doppler Effect/Redshift

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.

Select each statement about the Doppler Effect that is true.

• It occurs when a wave source moves towards an observer.

• It occurs when an observer moves towards a wave source.

• It occurs when a wave source moves away from an observer.

• It occurs when an observer moves away from a wave source.

Tags

NGSS.HS-PS4-1

Most distant galaxies show a red shift. This is considered evidence that the universe is ___.

• getting cooler

• expanding

• condensing into a small point

• swirling around

Is Galaxy A moving

• Away

• Towards

• Stationary

Tags

NGSS.HS-ESS1-2

NGSS.HS-PS4-1

Is the Galaxy moving

• Away

• Towards

• Stationary

Tags

NGSS.HS-ESS1-2

Use the image to identify the motion of the object relative to Earth.  Compare the absorption spectra of the star to what the star would look like if it were not moving at all relative to Earth.

• It is not moving
• It is moving away from Earth (Redshift)
• It is moving towards Earth (Blueshift)
• It is moving towards Earth (Redshift)

Tags

NGSS.HS-PS4-1

NGSS.HS-PS4-3

Based on  Doppler effect, which of the galaxies is moving away from Earth?

• A
• B 
• C
• A and B