big bang theory+doplar effec

Question 1

what are 2 pices of evidence that are in favour of the Big Bang theory called

Answer 1

1. cosmic background microwave radiation

2. redshift

Question 2

explain cosmic bag round microwave radiation

Answer 2

there are random microwaves everywhere in space. this would be expected if the univer expanded from short high energy waves present at the Big Bang would have stretched to microwave length

Question 3

explain redshift

Answer 3

visible light from other galaxies have slightly longer wave lengths than it should, suggesting that the galaxies are moving away from us.

the shift in the wavelength is towards the red spectrum so it is called the redshift

some galexies does have bigger redshift than others, this suggests that they are moving away from us faster which is because the are further

all galexies show a red shift. this shows a patter that is caused by an explosion and an expansion - evidence for Big Bang

Question 4

what is the Doppler effect

Answer 4

it’s the apparent change in the frequency of a wave caused by relative motion between the source of the wave and the observer

Question 5

explain the Doppler effect with a siren as an example

Answer 5

when a police car with the siren on speeds past you, you hear the siren in a different pitch

when it moves away from you the wave lengths are longer so the sound is lower. when it moves towards you the wave lengths are shorter so the sound is higher

Question 6

what makes the Doppler affect bigger

Answer 6

the faster it happens

Question 7

what does the Big Bang theory suggest

Answer 7

that the univer started from a point, then exploded, then expanded outwards

Question 8

what is the dollar effect used for

Answer 8

speeds of things