Define and describe a [ly]

[light year] Distance travelled by light in 1 year

Where does Microwave Background Radiation come from

High energy Gamma photons which have been Red shifted

Define and describe [AU]

[Astronomical Unit] Distance from the Earth to the Sun

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OCR Physics A-Level

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Space Astrophysics Cosmology

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Questions 16

Answers

1
Luminosity of a Star is Not Directly proportional to what
Surface Area
Core Temperature 3
Radius 2
Surface Temperature 4
2
Which of the following did not occur in the first second of the Big Bang Theory
primordial Helium forms
high energy gamma photons spread out
Hadrons form
stable quarks arise
3
what does a red supergiant evolve into next
supernova
Nebula
White Dwarf
Black hole
4
Define and describe a [ly]
[light year] Time taken for a photon to die
[light year] Distance travelled by light in 1 year
[light year] Time for light to reach Earth from the Sun
[light year] Distance travelled by a photon
5
Where does Microwave Background Radiation come from
Stars Exploding
Aliens making contact
High energy Gamma photons which have been Red shifted
People leaving their Microwaves on
6
what is the Chandrasekhar Limit
Maximum lifespan of a Black Hole
Maximum number of neutrons in a Neutron Star
Maximum temperature of a Red Giant
Maximum mass for a white dwarf
7
what is the current temperature of the universe
127°c
2.7°c
2.7 K
127 K
8
Which of the following is not part of the cosmological principle
laws of physics are universal
isotropic universe
universe is Homogeneous
universe is expanding
9
How did the universe change after the first second
Density has increased
Size has decreased
Temperature has decreased
Temperature has increased
10
which process must occur for a Protostar to form a Star
Nuclear Fusion
An Explosion
Gravitational Collapse
Redshift
11
Convert 1 Kms^-1 Mpc^-1 into s^-1
3.1 x10-19 s-1
3.2 x10-20 s-1
3.1 x1025 s-1
3.2 x10-8 s-1
12
which of the following can a Red Supergiant Not evolve into
White Dwarf
Supernova
Neutron star
Black hole
13
What will our sun eventually evolve into
White dwarf
Red Giant
Supernova
Red SuperGiant
14
Define and describe [AU]
[Astronomical Unit] Radius of our Galaxy
[Aphelion Unit] Furthest point from the sun in an orbit
[Astronomical Unit] Distance from the Earth to the Sun
[Arc Unit] 1° = 60 arcminutes
15
What makes up the core of a Red Supergiant
fusing iron
Helium
Hydrogen
Inert iron
16
Calculate the age of the universe using H₀ = 2.2x10^-18 s^-1
12 Billion years
140 million years
4 billion years
14 billion years

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