Exam #2

Question 1

What would be the distance from earth to a star if its:

Apparent magnitude is too and it’s absolute magnitude is six?

Answer 1

Closer than 10 parsecs

Question 2

What would be the distance from earth to a star if its:

Apparent magnitude is 15 and it’s absolute magnitude is 1?

Answer 2

Further than 10 parsecs

Question 3

What would be the distance from earth to a star if its:

Apparent magnitude is 3 and absolute magnitude is -3?

Answer 3

Further than 10 parsecs

Question 4

What spectral class star would have a peak wavelength that it emits shifted farthest towards the “red” end of the spectrum?

Answer 4

A M7 star

Question 5

What spectral class star would have its peak wavelength that it Emirates shifted farthest towards the blue end of the spectrum?

Answer 5

A B7 star

Question 6

Which spectral type star would email the least yellow light?

Answer 6

M5

Question 7

Which spectral type star what emit the least blue light?

Answer 7

M5

Question 8

Which spectral type star would emit the least red light?

Answer 8

M5

Question 9

Which color would a B3 spectral type star be?

Answer 9

Blue-ish

Question 10

Assume you are observing the spectra of two different stars. Star a exhibits a dark line shift by 10 nm towards the “blue” end of the spectrum while Star B exhibits a dark line shift by five nano meters towards the red end of the spectrum. From this data, what other conclusions can you make about these stars?

Answer 10

Star A has a greater radio velocity Than star B

Question 11

Considering Wiens law, which star from below would have the highest surface temperature?

Answer 11

A star with peak wavelength in the “violet”

Question 12

The Demon Star, Algol, represents the head of _________ in the constellation Perseus.

Answer 12

None

Question 13

What is the approximate apparent magnitude of the sun?

Answer 13

-26.5

Question 14

What is the approximate absolute magnitude of the sun?

Answer 14

5

Question 15

Another a name for the star “Sirius” is:

Answer 15

The Dog Star

Question 16

Every 5 magnitudes on the magnitude scale is equivalent to _______ times in brightness (light output).

Answer 16

100

Question 17

How many known Stars are within (closer than) a parsec from the Sun?

Answer 17

0

Question 18

Approximately how many stars, in total, have parallaxes less than 1 arc second, using the stellar triangulation method (baseline of 1au)?

Answer 18

Billions

Question 19

Which star system listed has the largest parallax?

Answer 19

Alpha Centauri (4.3 ly away)

Question 20

Which star system listed has the smallest parallax?

Answer 20

Deneb (1600 ly away)

Question 21

Henrietta Leavitt’s Period-Luminosity Relation for Cepheid Variable stars allowed Edwin Hubble to determine:

Answer 21

The distance of these stars

Question 22

Henrietta Leavitt’s discovered that the longer the period of a Cepheid Variable star, the greater it’s ________ was.

Answer 22

Absolute magnitude

Question 23

Even though absolute magnitude are usually not calculated for objects other than stars, what would be a good estimate for the moons absolute magnitude?

Answer 23

A very large positive number

Question 24

A certain star has an absolute magnitude of 4. With only this known, what else can you determine about the star?

Answer 24

None of the above!

Question 25

Why can't Triangulation be used to determine the distance to all stars?

Answer 25

Some stars have parallaxes which are too small to measure

Question 26

Who was the 1st to discover the other galaxies existed?

Answer 26

Hubble

Question 27

Who developed the "Stellar Spectral Sequence"?

Answer 27

Cannon

Question 28

The 1st Cepheid Variable star was found in the constellation of

Answer 28

Cepheus

Question 29

What is the spectral type of the sun?

Answer 29

G2

Question 30

What color would a G4 spectral type star be?

Answer 30

Yellow-ish

Question 31

What color would a M2 spectral type star be?

Answer 31

Red-ish

Question 32

The Ozone layer in the Earth's atmosphere mainly protects us from?

Answer 32

Ultraviolet

Question 33

What spectral type star has the highest surface temperature?

Answer 33

B5

Question 34

Who first realized that the "Stellar Spectral Sequence" represented the temperature of stars

Answer 34

Cecilia Payne

Question 35

Which star would be least common in the universe?

Answer 35

8.9 Mo

Question 36

Which star should be the most common in the universe?

Answer 36

1.3 Mo

Question 37

Assume you were to see the number/words "22 kilograms" and "50 pounds" printed on the same weight in the gym on earth. Now assume you take that weight to the Moon, where the gravity is only 1/6 of earths Gravity. To be accurate what number/word should be removed from the weight?

Answer 37

50 Pounds

Question 38

The most prominent Greenhouse gasses in our atmosphere are water vapor and ?

Answer 38

Carbon dioxide

Question 39

If the star Alpha Centauri A, which is a G2 spectral type star, were 1 au away from us, what would it's approximate apparent magnitude be?

Answer 39

-26.5

Question 40

What would be the distance from earth to a star if its: | Apparent magnitude is three and it's absolute magnitude is three?

Answer 40

10 parsecs