Topic 7

Question 1

Compare the Big Bang theories and steady state model

Answer 1

Steady space model has no beginning to space time whereas bing bang has a definite start to space time just under 14 billion years ago.
Big Bang suggest universe becomes less dense over expansion throughout time whereas steady model says density will stay the same
Both agree that universe is expanding

Question 2

Which model is the current accepted model and why

Answer 2

The Big Bang theory as there is more evidence to support it than the steady state model

Question 3

Describe evidence for the Big Bang theory using red shift

Answer 3

Red-shift provides evidence for the Big Bang theory as it shows that all objects in the universe are moving away from one another.
This suggests that the objects began from a single point, the point at which the Big Bang occurred.
Red shift shows that the universe is expanding

Question 4

Describe CMB radiation as evidence for Big Bang

Answer 4

It is considered to be the remnants of the Big Bang explosion.

Question 5

What happens if a wave source is moving relative to an observer

Answer 5

There will be a change in the observed frequency and wavelength

Question 6

Describe red shift from galaxies at different distances away from earth and how it shows evidence the universe is expanding

Answer 6

Light from distant galaxies in space is red-shifted.
The further a galaxy is from Earth, the greater the red-shift.
This means that the further away a galaxy is, the faster it is moving away from us. Therefore shows evidence that the universe is expanding

Question 7

How do big bang and steady state both account for red shift of galaxies

Answer 7

Big Bang - red shift shows all objects in the universe are moving away from each other

The Steady State model also accounts for red-shift because it states that new matter is being created to account for the expanding Universe.