WorksheetsAstro 1500 Trivia - November 1, 2024 - Lectures 17-18
Total questions: 19
Worksheet time: 11mins
What is a pulsar?
A supernova with an extreme magnetic field
A black hole periodically emitting Hawking Radiation
A rotating neutron star
An alien lighthouse
True of false: Any star with a birth mass less than 8 Solar Masses can NEVER go supernova?
True
False
Which of the following stars (in a single star system) would go supernova after dying?
A star with mass 3x Solar Mass
A star with mass 5x Solar Mass
A star with mass 8x Solar Mass
A star with mass 13x Solar Mass
Which of the following stars (in a single star system) would most likely become a black hole after dying?
A star with mass 20x Solar Masses
A star with mass 30x Solar Masses
A star with mass 50x Solar Masses
A star with mass 100x Solar Masses
For a new pulsar, what is their approximate rotational speed?
Miliseconds
Seconds
Minutes
Hours
What causes a pulsar to emit a beam of light?
The motion of electrons in a magnetic field
The collision and fusion of heavy elements due to the rotation
The core fluctuating in size, nearing a supernova
Intense gravitational waves
Why are pulsars handy as astrophysical clocks?
They are not, only real clocks are useful
We know the magnetic field development for pulsars and can measure them from earth
Gravitational Waves are emitted and we can measure the time from them
We know the approximate period of rotation for pulsars
True of false: A Pulsars rotation typically speed up over time
True
False
A short duration GRB is caused by ____, and a long duration GRB is caused by ____
A Black Hole, Merging Black Holes
Merging Neutron Stars, Hypernovas or Collapsars
Hypernovas or Collapsars, Supernovas
Pulsars, Merging Neutron Stars
What could form supermassive black holes?
Collapse of enormous gas clouds
They formed with the Universe
A merger of smaller black holes
A regular black hole consumed lots of non-stellar mass
How come two objects rotating around each other eventually creep together and merge?
The objects are slowed by gas clouds
They pull on each other as they rotate
Planets tug on the objects and slow them down
Gravitational waves remove angular momentum
Rank the types of black holes in order of mass (smallest to largest)
Primordial, stellar mass, intermediate mass, supermassive
Stellar mass, supermassive, intermediate mass, primordial
Stellar mass, primordial, intermediate mass, superrmassive
Primordial, intermediate mass, stellar mass, supermassive
What would happen to Earth's orbit if the Sun suddenly became a black hole and retained its same mass?
Earth would fall into the black hole
Earth's orbit would not change
Earth would fly off
Earth's orbit would become more elliptical
(Somewhat) random review question: an inert spacecraft is near a star. Which of these stars will exert the greatest gravitational force on it?
1 Solar mass, 2 AU away
2 Solar masses, 2 AU away
1 Solar mass, 1 AU away
2 Solar masses, 1 AU away
Which of the following is used to measure stellar distances?
Stellar Parallax
Black Holes
Pulsars
Gamma Ray Bursts
Why are black holes black?
Light cannot escape a black hole
Matter that compressed is black in color
Black holes are extremely cold
Black holes rotate so fast that light can't reflect off them
What happens an astronaut falling into a black hole? (Answers are from an outside observer's perspective of the astronaut--e.g., the astronaut gets redder/bluer, the astronaut's time seems to speed up/slow down)
Astronaut gets bluer, time slows down
Astronaut gets redder, time slows down
Astronaut gets bluer, time speeds up
Astronaut gets redder, time speeds up
What does relativity (significantly) affect on Earth?
Cars travelling the freeway
Cell phone communications
Launching space vehicles
Satellites
Which physics problems does general relativity explain?
Light being affected by gravity
Differential rotation of the Sun
Mercury's orbital wobble
Wobble of Earth's axis
