Exam 3

Question 1

Betelgeuse has an apparent magnitude of 0.50. Tau Ceti has an apparent magnitude of 5.68. Which looks brighter in the sky?

a. Betelgeuse
b. Tau Ceti

Answer 1

A. Betelgeuse

Question 2

You want to see Uranus with your eye. In Jan m=5.6 in Aug m=6.5. When should you watch for Uranus?
A. Jan
B. Aug

Answer 2

A. January

Question 3

You have two light bulbs 25 Watt and 100 Watt.
A)If you plug them both into the same type of lamp and put them 3 feet away, which looks brighter?
A. 25 W
B. 100 W

Answer 3

B

Question 4

You have two light bulbs 25 Watt and 100 Watt.
B) Now move the 100 Watt across the street?
A. 25 W
B. 100 W

Answer 4

maybe B

Question 5

You have two light bulbs 25 Watt and 100 Watt.
C) Now move the 100 W two blocks away?
A. 25 W B. 100 W

Answer 5

probably A

Question 6

Which Star is Brighter (giving off more light)?
Sirius M = 1.5 OR Betelgeuse M= -5.1

Vega M = 0.6 OR Proxima Centauri M = 15.4

Capella M = -0.5 OR Arcturus M = -0.3

Answer 6

Betelgeuse, Vega, Capells

Question 7

Apparent Magnitude

Answer 7

Apparent Brightness or Brightness is measured using

devices – watts per square meter

Question 8

Absolute Magnitude

Answer 8

the apparent magnitude the star would

have at 10 pc and compare to each otherc

Question 9

Luminosity

Answer 9

the total amount of

energy per second a star emits over the whole surface of the star.

Question 10

Emission Nebula

Answer 10

is a nebula formed of ionized gases that emit light of various colors.

Question 11

Reflection Nebula

Answer 11

is a cloud of gas and dust which does not create its own light, but instead shines by reflecting the light from nearby stars.

Question 12

Dark Nebula

Answer 12

a nonluminous nebula of dust and gas that is observable because it obscures light from other sources.

Question 13

Reaching end of Main Sequence Life

Answer 13

Core shrinks, increases density and fusion rate, heats the outer layers which then expand

Question 14

solar prominences

Answer 14

filaments seen on the side

Question 15

Photosphere

Answer 15

The deepest layer we can see, This area contains the Sunspots

Question 16

Chromosphere

Answer 16

Literally the Sphere of Color

Question 17

Spicules

Answer 17

Spikes of chromosphere’s material which stick up into the corona

Question 18

Sunspots

Answer 18

Irregularly shaped dark regions in Photosphere, They are dark looking because they are cooler portions of the sun

Question 19

Filaments

Answer 19

dark material arching high up, following the magnetic field lines

Question 20

Stellar Evolution

Answer 20

Hydrogen depleted in core
He Core shrinks – heats up
H shell fusion– expands atmosphere
Star goes to Red Giant Branch
He core fusion begins by triple alpha process
The outer layer expands, cools off, gets bigger and brighter.

Question 21

planetary nebula

Answer 21

The hot core emits ultraviolet radiation which excites the gas in the expanding atmosphere - glows

Question 22

Supernova Remnants

Answer 22

Notice the remnants have no shape, and are less dense then the formation nebula