Question 1

During the first moments of the Big Bang when elements could be created,nuclear fusion reactions made few heavy elements.Why not?

Accepted Answer

A) because all nuclei with masses greater than 4 hydrogen masses are unstable 
B) because no stable nuclei exist with masses of 5 or 8 hydrogen masses 
C) because the helium nucleus is unstable 
D) because the temperature and density were too low 
A) because all nuclei with masses greater than 4 hydrogen masses are unstable 
B) because no stable nuclei exist with masses of 5 or 8 hydrogen masses 
C) because the helium nucleus is unstable 
D) because the temperature and density were too low

Question 2

If the density of the universe is equal to the critical density,and H equals 50 km/sec/Mpc,then the true age of the universe is 13.3 billion years.

Accepted Answer

A) True 
 B)False

Question 3

Why is there a limit to the size of the observable universe?

Accepted Answer

A) because the universe has a finite age 
B) because galaxies appear to be moving away from us 
C) because the sky is dark at night 
D) because the universe has a finite radius 
A) because the universe has a finite age 
B) because galaxies appear to be moving away from us 
C) because the sky is dark at night 
D) because the universe has a finite radius

Question 4

What problems are solved by the theory of inflation?

Accepted Answer

A) flatness and horizon 
B) dark matter and dark energy 
C) Olbers' paradox and the cosmological principle 
D) homogeneity and isotropy 
A) flatness and horizon 
B) dark matter and dark energy 
C) Olbers' paradox and the cosmological principle 
D) homogeneity and isotropy

Question 5

If we lived in a static,unchanging universe,which of the following would you expect to see?

Accepted Answer

A) detection of the cosmic microwave background (CM
B)  
B) dark sky at night 
C) redshift of galaxies that change with distance 
D) galaxy properties that are constant with distance 
A) detection of the cosmic microwave background (CM
B)  
B) dark sky at night 
C) redshift of galaxies that change with distance 
D) galaxy properties that are constant with distance

Question 6

The redshifts of the galaxies imply that the universe is expanding and that we are at the centre.

Accepted Answer

A) True 
 B)False

Question 7

How can the Big Bang still be visible? In what form has it been detected?

Accepted Answer

The Big Bang, which is the leading expla

During the first moments of the Big Bang when elements could be created,nuclear fusion reactions made few heavy elements.Why not?

If the density of the universe is equal to the critical density,and H equals 50 km/sec/Mpc,then the true age of the universe is 13.3 billion years.

Why is there a limit to the size of the observable universe?

What problems are solved by the theory of inflation?

If we lived in a static,unchanging universe,which of the following would you expect to see?

The redshifts of the galaxies imply that the universe is expanding and that we are at the centre.

How can the Big Bang still be visible? In what form has it been detected?

The Scale of the Cosmos

User's Guide to the Sky

The Origin of Modern Astronomy

Astronomical Telescopes and Instruments

Sun Light and Sun Atoms

The Family of Stars

The Structure and Formation of Stars

The Deaths of Stars

The Milky Way Galaxy

Galaxies

The Origin of the Solar System

Comparative Planetology of the Terrestrial Planets

Comparative Planetology of the Jovian Planets

Life on Other Worlds

Filters

Exam 11: Cosmology in the 21st Century

During the first moments of the Big Bang when elements could be created,nuclear fusion reactions made few heavy elements.Why not?

If the density of the universe is equal to the critical density,and H equals 50 km/sec/Mpc,then the true age of the universe is 13.3 billion years.

Why is there a limit to the size of the observable universe?

What problems are solved by the theory of inflation?

If we lived in a static,unchanging universe,which of the following would you expect to see?

The redshifts of the galaxies imply that the universe is expanding and that we are at the centre.

How can the Big Bang still be visible? In what form has it been detected?

The Scale of the Cosmos

User's Guide to the Sky

The Origin of Modern Astronomy

Astronomical Telescopes and Instruments

Sun Light and Sun Atoms

The Family of Stars

The Structure and Formation of Stars

The Deaths of Stars

The Milky Way Galaxy

Galaxies

The Origin of the Solar System

Comparative Planetology of the Terrestrial Planets

Comparative Planetology of the Jovian Planets

Life on Other Worlds

Filters