Lecture 5

Question 1

The droppler shift

Answer 1

As the wave moves closer to you the higher the frequency will be, for sound it would sound louder/ higher pitched, for light the colour will get cooler (closer to blue)

As it moves away from you the frequency would be lower as it is spreaded out more, light would appear warmer (reder) and sound would sound lower

Question 2

How does light tell us the speed of a distant object

Answer 2

Droppler effect tells us how fast an object is moving towards or away from us, Blueshift = toward
Redshift= away

Question 3

How does light tell us the rotation rate of an object

Answer 3

The width of an objects spectral lines can tell us how fast it is rotating

Question 4

Refraction

Answer 4

Bending of light when it passes from one substance to another
Our eyes uses refracting to focus light