Origins Of The Universe

Question 1

What is the Big Bang theory ( 4 marks )

Answer 1

Universe is expanding

Everything seems to be moving away from one point

The point is the Big Bang

This is supported by cosmic background radiation

Question 2

What it the Doppler effect

Answer 2

The change in frequency of a wave
by the relative motion

between the source of a wave and the observer

Question 3

What happens when the source is coming towards you? (Doppler?

Answer 3

Pitch is high
Wavelength decrease
Frequency increase

Question 4

What happens when the source moves away from you?

Answer 4

Pitch is low
Wavelength increase
Frequency decrease

Question 5

What happens with pitch in the Doppler effect?

Answer 5

Pitch is high when the source is coming towards you

Pitch is low when it’s moving away from you

Question 6

What happens with wavelengths in the Doppler effect?

Answer 6

Wavelengths decrease when the source is coming towards you

They increase when the source is moving away from you

Question 7

What happens with frequency in the Doppler effect?

Answer 7

Frequency increases when the source is moving towards you

It decreases when the source is moving away from you

Question 8

What is red shift?

Answer 8

Absorption lines of helium shift to the red end of the spectrum?

Question 9

How does red shift prove the Big Bang?

Answer 9

Lines change because of the Doppler effect

Further away a star is, the more light is red shifted

Shows the universe is expanding

Distant galaxies are therefore moving away from us

The further away a galaxy is the faster it is moving

Suggests everything is moving away from one point

Point is Big Bang

Question 10

What is cosmic background radiation

Answer 10

Remains of energy after the Big Bang

Only the Big Bang can explain it