Doppler Effect, Redshift/Blueshift

Front

What best describes the doppler effect?

Back

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

Front

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

Back

Moving towards the Earth

Front

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

Back

Moving away from the Earth

Front

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

Back

Redshift

Front

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.

Back

It is moving away from Earth (Redshift)

Front

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.

Back

It is moving towards Earth (Blueshift)

Front

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.

Back

It is not moving relative to Earth

Front

An object that is moving VERY fast away from Earth would have ________ than an object that is moving very slow away from Earth.

Back

More Redshift

Front

An object that is moving VERY fast towards the Earth would have ________ than an object that is moving very slow towards the Earth.

Back

More Blueshift

Front

Which discovery(ies) came from our understanding redshift/ blueshift?

Back

The universe is expanding, Most galaxies are moving away from us, Andromeda galaxy will collide with the Milky way in 3.75 billion years, All of the above (and many more)