Astronomy Flashcard 09

Front

Because of the Doppler Effect, as a siren approaches you, its pitch will:

Back

,,,,

Front

What causes the Doppler Effect in sound or light?

Back

The wave frequency changes as objects move.

Front

Light from another galaxy shows a “red shift.” Which statement explains the red shift?

Back

The galaxy is moving away from Earth.

Front

Light from a star that is moving away from the Earth has a:

Back

longer wavelength and lower frequency than normal.

Front

If a wave is blue-shifted the wavelengths are ______ than normal.

Back

shorter

Front

The apparent change in light frequency of a galaxy that is moving away from us is called:

Back

a red shift.

Front

How is the Doppler Effect important in astronomy?

Back

It can tell us if celestial objects are moving toward or away from us.

Front

The diagram shows a standard spectrum compared to a spectrum produced from a distant star. Which conclusion can be made by comparing the two spectra?

Back

The distant star’s lines have shifted toward the red end of the spectrum and the star is moving away from earth.

Front

Why can't scientists use parallax to find long distances?

Back

Because parallax decreases at large distances.

Front

In the diagram, which star is farthest away from Earth?

Back

Star A