doppler effect and redshift.

Question 1

which light colour is longer red or blue?

Answer 1

red

Question 2

if the light colour is red what does it mean?

Answer 2

faster. higher velocity

Question 3

what is an explained example of the doppler effect?

Answer 3

when a car approaches you the sound waves from it squashed up so its wavelength is shorter
car travels away the sound waves are stretched so longer wavelength

Question 4

what does a shorter wavelength mean?

Answer 4

higher frequency

Question 5

what does a longer wavelength suggest?

Answer 5

lower frequency

Question 6

what is redshift evidence for?

Answer 6

expanding universe.

Question 7

what does CMBR stand for?

Answer 7

cosmic microwave background radiation

Question 8

what does CMBR provide evidence for?

Answer 8

support idea of big bang as start of the universe.

Question 9

what percentage of the universe consists of visible matter?

Answer 9

4%

Question 10

how does the big bang theory describe the universe when it began?

Answer 10

hot and dense

Question 11

the andromeda galaxy is moving towards earth. describe how the wavelength and frequency of the light from it seems to have changed when viewed from earth?

Answer 11

wavelength decreased.