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SES4U Studying Stars

Total questions: 63

Worksheet time: 2hrs 30mins

Name
Class
Date
1.

The law that says that color shifts toward shorter wavelengths when temperature increases is:

a)

Planck's Law

b)

Stephan-Boltzmann Law

c)

Hubble's Law

d)

Wien's Law

2.

The radiation emitted by a heated object is known as:

a)

Blue Body Radiation

b)

Black Body Radiation

c)

Spectroscopic glow

d)

Blake's Radiation

3.
The radiation emitted by a dense heated object is a(n):
a)
continuous spectrum
b)
emission spectrum
c)
absorption spectrum
d)
absorbtion spectrum
4.

The radiation emitted by a dense heated object but seen through a cooler, less dense gas is a(n):

a)

continuous spectrum

b)

emission spectrum

c)

absorption spectrum

d)

hubble spectrum

5.
What set of lines to astronomers use to classify stars?
a)
Iron Lines
b)
Iron Man Lines
c)
Helium Lines
d)
Hydrogen lines
6.
Which of the following would be the hottest classification of stars?
a)
A
b)
B
c)
F
d)
O
7.
Which of the following would be the coolest classification of stars?
a)
M
b)
B
c)
F
d)
O
8.
Visible light is the only type of electromagnetic radiation.
a)
True
b)
False
9.
Spectral lines help scientists to determine the chemical composition of remote astronomical objects.
a)
True
b)
False
10.
Every element has its own unique atomic spectra.
a)
True
b)
False
11.
The Sun emits a continuous spectra.
a)
True
b)
False
12.
Blue visible light has a shorter wavelength than red visible light.
a)
True
b)
False
13.

Red light is "hotter" than blue light.

a)

True

b)

False

14.
Wien's law states that the higher the temperature, the shorter the peak wavelength of a blackbody's radiation.
a)
True
b)
False
15.
Spectra occur because electrons emit and absorb photons with only certain ______.
a)
wavelengths
b)
ions
c)
emissions
d)
functions
16.
Absorption lines create _____ spectral lines on a visible light spectra due to the electrons moving into their _____ state.
a)
dark; excited
b)
dark; ground
c)
bright; excited
d)
bright; ground
17.
Which of the following type of EM radiation has wavelengths longer than visible light? 
a)
Microwave
b)
Ultraviolet
c)
Gamma Rays
d)
Yellow Visible Light
18.
John observes three different colored stars.  What can John infer about the three stars
a)
The three stars have different temperatures
b)
The three stars have the same temperatures
c)
The three stars have the same luminosity
d)
The three stars have different luminosity
19.
True or FalseThe Earth's Sun is classified as a main sequence star
a)
True
b)
False
20.

Main sequence stars:

a)

increase in size while they increase in temperature.

b)

increase in brightness while they decrease in temperature.

c)

decrease in brightness while they decrease in temperature.

d)

decrease in brightness while they increase in temperature.

21.

Red colored stars:

a)

are stars with cool temperatures

b)

are stars with hot temperatures

c)

are all stars with bright luminosity.

d)

are all stars with dim luminosity

22.
A Hertzsprung-Russell diagram is shown below.
Based on this diagram, which type of stars would belong to spectral class M and have the highest luminosity?
a)
Main-sequence stars
b)
Giants
c)
White dwarfs
d)
Supergiants
23.
What does the HR-Diagram NOT tell us?
a)
Size of star
b)
Color of star
c)
Location of star
d)
Magnitude of star
24.
Based on the chart above, which Star has the lowest luminosity? 
a)
Sirius
b)
Rigel
c)
Arcturus
d)
Alderbaran
25.
  The table above compiles information about the distance of various stars from Earth, their apparent magnitude, and their absolute magnitude. 
Which star has the greatest luminosity?
a)
Sirius
b)
Rigel
c)
Arcturus
d)
Aldebaran
26.
The table above compiles information about the distance of various stars from Earth, their apparent magnitude, and their absolute magnitude.
Which star shines brightest as seen from Earth?
a)
Sirius
b)
Rigel
c)
Vega
d)
Betelgeuse 
27.
Four of the types of electromagnetic waves are microwaves, radio waves, infrared waves, and visible light waves.  Which of these waves has the MOST energy?
a)
Microwaves
b)
Radiowaves
c)
Infrared
d)
Visible Light
28.
Felix examined several photos of stars. To compare their temperatures, he looked at the colors of the stars. He organized the photos in order from coolest to hottest. Which of these answers shows the correct order? 
a)
red, yellow, white, blue
b)
blue, yellow, white, red
c)
yellow, white, blue, red
d)
white, blue, yellow, red
29.
How are we able to detect different colors in the visible light spectrum? 
a)
Temperature
b)
Distance
c)
Wavelength
d)
Reflection 
30.
What does the term luminosity mean?
a)
size
b)
color
c)
brightness
d)
temperature
31.
Which of the following is most closely related to the temperature of a star?
a)
color
b)
luminosity
c)
size
d)
category
32.
What is the relationship between the X and Y values for main sequence stars?
a)
as luminosity increases temperature decreases
b)
As temperature increases so does brightness- proportional relationship
c)
The stars with the most luminosity are the coldest stars
d)
X and Y have no relationship
33.
Luminosity measures _____
a)
the size of a star
b)
the energy given off by a star
c)
the color of a star
d)
the age of a star
34.
Absolute magnitude compares star brightness if every star was the same distance away from us.
a)
True
b)
False
35.
Most stars are identified as ___________ on an H-R Diagram?
a)
Supergiants
b)
Giants
c)
Main Sequence
d)
White Dwarf
36.
Analyze this HR Diagram. Which group of stars is considered to have lower than average luminosity as well as a higher than average temperature?
a)
Giants
b)
Main Sequence
c)
White Dwarfs
d)
Super Giants
37.
Analyze this HR Diagram. Which group of stars is considered to have higher than average luminosity as well as a lower than average temperature?
a)
Giants
b)
Main Sequence
c)
White Dwarfs
d)
Super Giants
38.

What units do scientists use to measure distances in space? (select all that apply)

a)

gigameters

b)

parsecs

c)

astronomical units

d)

light-years

39.

Which refers to a star’s apparent magnitude?

a)

size

b)

mass

c)

color

d)

brightness

40.
A light year is...
a)
The speed light travels
b)
How long it takes light to get to you from the sun
c)
The distance light can travel in a year
d)
How many years it takes light to be emitted
41.
Proxima Centauri is the closest star to Earth after the Sun and is located 4.3 light years away from Earth. How long does it take light from Proxima Centauri to reach Earth?
a)
8 minutes
b)
4.3 years
c)
3.26 years
d)
15.48 years
42.
The average distance between the earth and the sun is the 
a)
Astronomical unit 
b)
Light year
c)
Parsec
d)
Perihelion
43.
Which is biggest?
a)
Astronomical Unit
b)
Light Year
c)
Parsec
44.
Why can't scientists use parallax to find long distances?
a)
because parallax decreases at large distances
b)
because parallax increases at large distances
c)
because they can't get starlight from very far away
d)
That's not true, parallax is a great tool for finding far distances
45.

The telescope was invented in _______ in the _______

a)

China, 2nd century

b)

Europe, 1600s

c)

Greece, 1st century BCE

d)

India, 800s

46.

Of the options below, the heliocentric model for the solar system was first proposed

a)

in ancient Greece

b)

by Aztecs

c)

by Galileo

d)

in ancient Egypt

47.

Which of the following was not discovered by Galileo?

a)

The moon is "imperfect".

b)

Jupiter has moons

c)

Venus has phases, like our moon

d)

There are other galaxies outside of ours

48.

A parsec

a)

is one astronomical unit

b)

is how long it takes light to travel 10,000 km

c)

is one arc second of parallax

d)

is a variable star used for measuring distance

49.

Parallax measurements to star use 2 different locations

a)

from telescopes on earth

b)

from the earth's rotating over the course of a day

c)

from the earth's revolving over the course of a year

d)

from the moon's revolving over the course fo a month

50.

A class 1 star

a)

Has a luminosity of 1 W/m2

b)

Is the brightest visible star

c)

is 6x less bright than a class 6 star

d)

has an absolute magnitude of 10

51.

For a star that is 5 parsecs away, it's apparent magnitude is ______________ its absolute magnitude

a)

less than

b)

greater than

c)

the same as

d)

variable, compared to

52.

We can tell the temperature of a star from its

a)

most intense wavelength

b)

emission spectrum

c)

absorption spectrum

d)

brightness

53.

Luminosity generally increases with (select all that apply)

a)

proximity to earth

b)

radius

c)

mass

d)

temperature

54.

The composition of distant stars can be obtained by

a)

samples from them

b)

analyzing the temperature

c)

analyzing the absorption lines

d)

looking at their radius

55.

Two stars are observed to have moved relative to the background stars. The star that appeared to move more must be:

a)

A planet

b)

A cepheid variable star

c)

closer

d)

farther

56.

Star A has a larger apparent magnitude, but the same absolute magnitude, as Star B. This tells us that Star A is:

a)

More luminous

b)

Less luminous

c)

Closer

d)

Farther away

57.

The law that allows us to use brightness and temperature information to determine radius is:

a)

Planck's Law

b)

Stephan-Boltzmann Law

c)

Hubble's Law

d)

Wien's Law

58.

[calculation]

A star has twice the sun's temperature, and twice its luminosity. The radius must be __________ that of the sun

a)

0.125

b)

0.35

c)

8

d)

32

59.

[Calculation]

A star is found to have a peak radiation wavelength of 760 nm. Its temperature

a)

cannot be obtained from this information

b)

is roughly 1 solar unit

c)

is less than that of our sun

d)

is far hotter than our sun.

60.

[calculation]

Proxima Centuri is the next nearest star to the earth, after the sun is over 266,000 AU away. How many light years is this?

a)

1.7 x1010 ly

b)

4.2 ly

c)

96 ly

d)

500 ly

61.

[calculation]

Betelgeuse is roughly 1,180 times the sun's radius. Roughly how many km is that?

a)

1,180 km

b)

10, 000 km

c)

120, 000 km

d)

821 million km

62.

The Andromeda "nebulous"

a)

is on the outskirts of our solar system

b)

is in our section of the milky way

c)

is an entirely different galaxy from the milky way

d)

is in fact disintegrated planet

63.

(calculation)

A distant star is found to have 16x the sun's luminosity, and twice the sun's temperature. How many times the sun's radius must it be?

a)

1x

b)

32x bigger

c)

4x bigger

d)

4x smaller

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