The Physics of Astrophysics (Option E) Part 3

20 Questions on the final topic 10.8 of HL Astrophysics (Option E) Covering cosmology, requires knowledge of newton's model of the universe, Olbers paradox and the descriptions and explanations of why we believe what we do about the history and fate of the universe.

Newton's model of the universe made four assumptions which were that the universe is...?
Infinitely large, Infinitely old, Static and Uniform
1 of 18
Olbers' Paradox disproved Newton's model by claiming that in such a universe...?
Due to the absorption and re-emission of electromagnetic radiation, the intensity of light incident on earth would also be infinite
2 of 18
The different extent of red shifts of distant galaxies implies that the universe is...?
Expanding
3 of 18
The reason galaxies move apart is because of...?
The expansion of space between them
4 of 18
The relationship between a galaxies distance (Mpc) from earth and it's recessional velocity (km/s)...?
Directly proportional
5 of 18
The gradient of the line plotted on such a graph as stated in question 5 is Hubble's constant (Ho), 1 / Ho gives...?
Equal to the age of the universe 1.36 x 10^-10 years
6 of 18
The main assumption made in the assigning of this astronomical constant to 1/Ho is that...?
The velocity of the galaxies is constant
7 of 18
When the universe was at a temperature of 10^32K...?
Only fundamental particles and photons existed in a very small space
8 of 18
300,000 years after the birth of the universe at a temperature of 4000K...?
Protons and small atoms such as helium and hydrogen began to form
9 of 18
When the universe was 10^9 years...?
Galaxies began to form
10 of 18
Galaxies formed because of...?
Irregularities in the distribution of matter
11 of 18
The reason for the observed cosmological red-shift of cosmic background radiation is because of...?
The expansion of space causing the wavelengths of light to become longer
12 of 18
The determining factor in the fate of the universe is...?
The density of the universe
13 of 18
The universe will eventually return to an infinitely small dense state in a 'big crunch' in a closed universe if...?
ρ(critical value) < ρ(universe)
14 of 18
The universe will expand infinitely causing a 'big freeze' in a open universe if...?
ρ(critical value) > ρ(universe)
15 of 18
The universe will reach a stable state and size causing a flat universe if...?
ρ(critical value) = ρ(universe)
16 of 18
The total observable mass in the universe accounts for an estimated...?
4% of the mass of the universe
17 of 18
The effect of the increasing rate of separation of the galaxies is accounted for by...?
Dark energy
18 of 18

Other cards in this set

Card 2

Front

Olbers' Paradox disproved Newton's model by claiming that in such a universe...?

Back

Due to the absorption and re-emission of electromagnetic radiation, the intensity of light incident on earth would also be infinite

Card 3

Front

The different extent of red shifts of distant galaxies implies that the universe is...?

Back

Preview of the front of card 3

Card 4

Front

The reason galaxies move apart is because of...?

Back

Preview of the front of card 4

Card 5

Front

The relationship between a galaxies distance (Mpc) from earth and it's recessional velocity (km/s)...?

Back

Preview of the front of card 5
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