Astronomy​ ​Coursework: ​Physics​ ​180 Final​ ​Exam

Astronomy-Physics180
Final Exam May8th, 2017
Name
Instructions
* This is a timed, in-class final exam, with problems weighted as noted.
* Please read each problem carefully.
* SHOW ALL WORK. Put final answers in the box provided, and include units if appropriate.
* No calculators or electronic devices are allowed. You will receive no credit for this test if you use one.
* If anything is not clear, please raise your hand and ask me.
Initial Here to verify you read the instructions
1 (2points) What is the age of the universe?
13.73 billion years
2 (2points) What are the age of the Sun?
5 billion years
3 (2points) The​ ​amount​ ​of​ ​“stuff”​ ​that​ ​is​ ​contained​ ​within​ ​a​ ​world​ ​is​ ​ its
1 Mass.
2 Radius.
3 Age.
4 Density.
5 Temperature.
4 (2points) The average distance between the Sun and the Earth is:
6 1m.
7 1km.
8 1AU.
9 1pc.
10 1lyr.
5 (2points) The supermassive black hole in the center of our Galaxy has an event horizon with a radius most similar to:
A large asteroid.
The Earth.
The orbit of Earth.
Jupiter
The orbit of Neptune.
6 (2points) If an alien civilization replaced the Sun with a 1 solar mass black hole, then:
The Earth and the rest of the Solar System would get sucked in.
The greenhouse effect on Earth would be stopped.
The magnetic field of Jupiter would be weakened.
The earth would continue on its present orbit.
The Kuiper belt would be reheated.
7 (2points) Red giant stars are:
Small and cool.
Large and cool.
Small and hot.
Large and hot.
8 (2points) White dwarf stars are:
Small and cool.
Large and cool.
Small and hot.
Large and hot.
9 (2points) The final stage of the Sun’s evolution will be as a:
Red dwarf star.
Red giant star.
White dwarf star.
Neutron star.
Black hole.
10.(2points)You have observed a bright, blue super giant star. You are most likely to see this star in:
* The solar system.
* The disk of the Galaxy.
* The halo of the Galaxy.
* The center of the Galaxy.
* The asteroid belt.
11.(2points)Light is produced in the
* Core
* Radiative zone
* Convective zone
* Photosphere
* Corona
of the Sun.
12.(2points)The coolest component of the Sun is the.
* Core
* Radiative zone
* Convective zone
* Photosphere
* Corona
13.(2points) Light leaving the Sun takes the longest amount of time to cross
through the.
* Core
* Radiative zone
* Convective zone
* Photosphere
* Corona
14.(2points)The least dense component of the Sun is the Corona
* Core
* Radiative zone
* Convective zone
* Photosphere
* Corona
15.(2points)The search for life in the Universe will use
* The presence of water on another planet.
.
as a sign of life.
* The presence of greenhouse gasses in the atmosphere of another planet.
* The presence of gases out of chemical equilibrium in another planet.
* The presence of heated geysers of water on the surface of another planet.
* The presence of a magnetic field in another planet.
16.(2points)Three worlds in our solar system have hydrothermal vents at the bottom of their oceans. They are:
* Venus, Earth and Mars.
* Mars, Pluto and Triton.
* Earth, Enceladus and Europa.
* Enceladus, Europa and Triton.
* Earth, Enceladus and Venus.
17.(2points)You have discovered a new extrasolar planet after 5 years of observations. During that time, the planet completes five trips around its host star. It’s average distance from the star is:
* 0.5AU.
* 1AU.
* 2AU.
* 4AU.
* 5AU.
In 5 years there are 5 orbits orbit per year is 1 P2=AU3, where P is year P^1=AU^1
18.(2points)The wobble method of planet detection can most easily detect planets that are:
* Massive and far from their star.
* Large and far from their star.
* Massive and close to their star.
* Small and close to their star.
* Small and between us and its star.
19.(2points)The transit method of extrasolar planet detection can measure the:
* Mass and period of a planet.
* Radius and period of the planet.
* Density and mass of the planet.
* Period and age of the planet.
* The magnetic field and period of the planet.
20.(2points) The first planets outside of the solar system were detected using the:
* Wobble method.
* Transit method.
* Astrometry method.
* Gravitational microlensing method.
* Direct imaging method.
21.(2points)The detection technique that has discovered the largest number of planets is the:
* Wobble method.
* Transit method.
* Astrometry method.