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A star is 230 light years away. The light we see tonight from that star left it
a). the time depends on which part of the sky the star is in
b.) 230 years ago
c.) 2.3 years ago
d.) one year ago
e.) 23 years ago
b.) 230 years ago
a light year is
a.) the time it takes light travel between the Sun and the furthest planet
b.) the time it takes a beam of light to go completely around the Earth’s orbit
c.) the distance between the Sun and the next star
d.) the distance that light travels in one year
d.) the distance that light travels in one year
The light which allows you to see this very interesting exam is made up of waves. In these waves, the distance between crests is called the:
a.) frequency
b.) amplitude
c.) wavelength
d.) velocity
c.) wavelength
Which of the following is most abundant in the Universe?
a.) helium
b.) carbon
c.) water
d.) oxygen
a.) helium
We have two waves of light, A and B. Wave A has a higher frequency than wave B. Then wave B must have:
a.) this can’t be determined from the information given
b.) lower speed
c.) longer wavelength
d.) higher speed
e.) shorter wavelength
c.) longer wavelength
When an atom has lost one or more electrons, it is said to be:
a. ) ionized
b.) in its ground state
c.) in its ground state
d.) red shifted
e.) excited
a. ) ionized
To go from a lower level in an atom to a higher level, an electron must
a.) lose its electric charge
b.) absorb a photon of energy
c.) give off a photon of energy
d.) wait until the atom has change into another atom with more protons
b.) absorb a photon of energy
Newton showed that to change the direction in which an object is moving, one needs to apply:
a.) a perigee
b.) an orbit
c.) a force
d.) an inertia
c.) a force
Which of the following statements about the force of gravity is FALSE?
a.) it causes the paths of the planets to be ellipses and not straight lines
b.) its strength is inversely proportional to the mass: the more mass, the less gravity
c.) the force never becomes zero
d.) it is a universal force, which acts everywhere in space
e.) its strength decreases as the square of the distance
b.) its strength is inversely proportional to the mass: the more mass, the less gravity
Which of the following reasons are NOT TRUE of why astronauts float around in the International Space Station instead of falling? (Multiple correct answers are possible, select all that apply)
a.) the station is so far from the Earth, gravity is negligible
b.) the space station and the astronauts are in free fall.
c.) the rules Newton developed for gravity only hold on Earth, not once you get into space
d.) the station's gravity balances the Earth's, so that the net gravity is zero
e.) the station is under the same gravitational acceleration as the astronauts
a.) the station is so far from the Earth, gravity is negligible
c.) the rules Newton developed for gravity only hold on Earth, not once you get into space
As astronomers have learned more about the structure of the Sun, they have found that it
a.) is made entirely of hot gas
b.) has a small solid core inside
c.) is made entirely of liquid, with a tiny bit of hot gas on the outside
d.) is solid throughout, but with a large very hot atmosphere
a.) is made entirely of hot gas
The most common element in the Sun is
a.) helium
b.) hydrogen
c.) water
d.) nitrogen
e.) iron
b.) hydrogen
You are out on the beach, enjoying the warm sunshine with friends. As you glance up at the Sun, the part of the Sun that you can see directly is called its:
a.) corona
b.) chromosphere
c.) heliosphere
d.) core
e.) photosphere
e.) photosphere
Today we realize that the source of energy for the Sun is a process called
a.) nuclear fusion
b.) mechanical to thermal energy conversion
c.) Kelvin-Helmholtz contraction
d.) radioactivity
a.) nuclear fusion
According to the formula E=mc2,
a.) energy can travel much faster than light (in fact its speed can be the speed of light squared)
b.) mass has to travel at the speed of light before it can produce any energy
c.) a little bit of mass can be converted into a substantial amount of energy
d.) when two masses collide, we always get a lot of light
c.) a little bit of mass can be converted into a substantial amount of energy
The antimatter version of an electron is called a
a.) protron
b.) neutrino
c.) positron
d.) antitron
c.) positron
What colored photon would have more energy, ultraviolet or infrared?
a.) infrared
b.) ultraviolet
b.) ultraviolet
What is the third most common element in the sun?
a.) helium
b.) iron
c.) carbon
d.) hydrogen
e.) oxygen
e.) oxygen
Which particle has more mass?
a.) neutron
b.) proton
b.) neutron
At the average human walking speed, how long would it take to circle the sun's surface assuming a radius of one solar radii?
a.) 101 years
b.) 104 years
c.) 107 years
d.) 110 years
b.) 104 years
How long would it take to walk to Proxima Centauri?
A) 26.5 kyr
B) 265 kyr
C) 2.65 Myr
D) 26.5 Myr
E) 265 Myr
b.) 265 kyr
Green light has a wavelength of about 520 nm. Approximately, what would be the temperature of a black body with its peak radiation in green light?
A) 5800 K
B) 6100 K
C) 6400 K
D) 5500 K
a.) 5800 K
What is the ratio of the luminosity of star A (radius=R,temperature=2T) to start B (radius=2R,temperature=T)?
A) 2
B) 4
C) 16
D) 1
E) 0.5
b.) 4
What sort of electromagnetic rays have just enough energy to produce an electron.
A) UV
B) X-ray
C) Gamma
D) Cosmic
c.) gamma
Object A is 100 times fainter than object B. What is the magnitude of object A minus the magnitude of object B?
A) -7.5
B) -5
C) -3
D) -2.5
E) 2.5
F) 3
G) 5
H) 7.5
g.) 5
Observations reveal that Telek A is 2 AU from the center of mass while Telek B is 8 AU from the center of mass. Which star is more massive?
A) Telek A
B) Telek B
C) They have the same mass
D) Cannot be determined
a.) Telek A
Alpha Centauri A (1.1 Msun) & B (0.9 Msun) are a binary star system with an orbital period of 80 years. What is the semi-major axis of their orbit rounded to the nearest AU?
A) 11 AU
B) 23 AU
C) 29 AU
D) 31 AU
E) 40 AU
b.) 23 AU
Note 
Flashcard (27)