More cards in this set

What is sometimes thought of phones and their effect on people?

What are optical fibres?

Why are optical fibres useful?

What is the doppler effect?

How the doppler effect can be demonstrated with sound waves?

What happens to the wavelength and frequency when the source moves away from and towards the observer during?

What is red-shift?

What is blue shift?

What does the red shift suggest?

What does it mean that the galaxies are moving away from each other?