Test 2

Question 1

What is the third element to fuse in a low mass star?

a. Hydrogen
b. Helium
c. Carbon
d. None of the above

Answer 1

d. None of the above

Question 2

What fraction of a star’s mass is ejected in the planetary nebula phase?

a. 1/2
b. 1/3
c. 1/4
d. 1/5

Answer 2

b. 1/3

Question 3

A supernova remnant with a mass of 2.75 solar masses would become…

a. a white dwarf
b. a neutron star
c. a black hole
d. cannot be determined

Answer 3

b. a neutron star

Question 4

What is the fuel for the triple alpha process?

a. hydrogen
b. helium
c. carbon
d. iron

Answer 4

b. helium

Question 5

What is on the horizontal axis of the H-R diagram?

a. Mass
b. Luminosity
c. Distance
d. Temperature

Answer 5

d. Temperature

Question 6

How many components are there in the Earth’s magnetic dynamo?

a. 1
b. 2
c. 3
d. 4

Answer 6

c. 3

Question 7

What is true about the rotational and magnetic axes of a neutron star?

a. they are both fixed
b. neither one is fixed
c. only the rotational axis is fixed
d. only the magnetic axis is fixed

Answer 7

a. they are both fixed

Question 8

What is the distance from a black hole where the orbital speed is equal to the speed of light called?

a. event horizon
b. exit cone
c. stability boundary
d. none of the above

Answer 8

d. none of the above

Question 9

Which star population is associated with multiple star forming generations?

a. Pop I
b. Pop II
c. Pop III
d. all of the above

Answer 9

a. pop I

Question 10

What component of a spiral galaxy contains Pop II stars?

a. bulge
b. disk
c. halo
d. all of the above

Answer 10

c. halo

Question 11

Which elliptical galaxy classification is associated with a galaxy that appears spherical in shape?

a. E1
b. E3
c. E7
d. E0

Answer 11

d. E0

Question 12

How many spiral classifications are there?

a. 2
b. 4
c. 6
d. 8

Answer 12

d. 8

Question 13

How many photos are needed for the solar experiment?

a. 1
b. 2
c. 3
d. 4

Answer 13

b. 2

Question 14

What is the main benefit of the Earth’s magnetic field? What happens to the charged particles that get trapped by this field? Briefly explain why the Earth’s magnetic axis either is or is not fixed?

Answer 14

• core of earth is molten, full of charged particles
• earth’s rotates quickly, particles always in motion
• this motion produces gravity, keeps us from floating away
• also keeps all matter on earth from collapsing in on itself
• because of molten core in motion, always in flux and shifts magnetic axis accordingly

Question 15

What is the main benefit of the Earth’s magnetic field? What happens to the charged particles that get trapped by this field? Briefly explain why the Earth’s magnetic axis either is or is not fixed?

Answer 15

• core of earth is molten, full of charged particles
• earth’s rotates quickly, particles always in motion
• this motion produces gravity, keeps us from floating away
• also keeps all matter on earth from collapsing in on itself
• because of molten core in motion, always in flux and shifts magnetic axis accordingly

Question 16

Discuss the concept of multiple star forming generations. In what component of the galaxy does this take place? How does this help to create Earth-like planets?

Answer 16

• molecular cloud to star evolves and explodes
• heavier matter is released into a galaxy
• this forms and continues in the disk
• process is repeated, albeit with heavier matter
• four or five generations later, there is enough heavier matter for an earth-like planet to form