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WorksheetsRound 2
Total questions: 98
Worksheet time: 33mins
Which curves provide evidence for the existence of dark matter?
Rotation curves
Elliptical curves
Spiral curves
Gravitational curves
What is one hypothesized particle that dark matter could be composed of?
Photons
Axions
Electrons
Protons
Which of the following is a property of dark matter?
Emits electromagnetic radiation
Does not interact with light
Visible to telescopes
Found only in black holes
Which term describes the bending of light by massive objects, suggesting dark matter's presence?
Redshift
Lensing
Diffraction
Refraction
What does the cosmic microwave background (CMB) help scientists study?
(a)
What is the acronym for Weakly Interacting Massive Particles?
(a)
What percentage of the universe’s matter is dark matter?
(a)
Axions are one type of (a) particle hypothesized to make up dark matter.
Dark matter is invisible because it does not emit or absorb (a) .
The outer regions of galaxies rotate (a) than expected due to dark matter.
Which of these searches for signals from dark matter annihilation?
Fermi Telescope
Large Hadron Collider
LUX Experiment
Hubble Telescope
Why is dark matter difficult to detect?
It is far from galaxies
It has no electromagnetic interaction
It is too massive to measure
It decays quickly
What type of detection focuses on annihilation products of dark matter?
(a)
What is one reason dark matter is challenging to detect?
(a)
Which experiment measures interactions of dark matter with atomic nuclei?
(a)
Direct detection experiments attempt to measure (a) between dark matter and ordinary matter.
The (a) experiment is an example of indirect dark matter detection.
Dark matter detection relies on its gravitational effects and lack of (a) interactions.
How does dark matter help galaxies maintain their structure?
Absorbs electromagnetic radiation
Provides extra gravitational pull
Emits cosmic rays
Reduces gravitational effects
What percentage of the universe’s total mass-energy is made up of dark matter?
15%
50%
27%
85%
The study of dark matter can help in understanding:
Planetary motion
Evolution of stars
Solar system dynamics
The fate of the universe
Which force does dark matter influence most in galaxies?
Electromagnetic
Nuclear
Weak force
Gravitational
What property of galaxies is influenced by dark matter?
(a)
Name one scientific field advanced by dark matter research.
(a)
What does the study of dark matter help us understand about the universe?
(a)
Dark matter provides additional (a) that holds galaxies together.
Dark matter research bridges the gap between particle physics and (a) .
About (a) % of the universe's total mass-energy is dark matter.
What is the Schwarzschild radius?
The distance from a black hole where light cannot escape
The radius of a black hole's event horizon
) The distance from the black hole to its accretion disk
The radius of the black hole's singularity
Which scientist first predicted the existence of black holes?
Albert Einstein
Stephen Hawking
Karl Schwarzschild
John Wheeler
What is the event horizon of a black hole?
The core of a black hole
The boundary beyond which nothing can escape
The region where matter begins to spin rapidly
1. The outer edge of the accretion disk
What is a singularity in the context of a black hole?
The point at the event horizon where gravity is strongest
The point at the event horizon where gravity is strongest
The center of the black hole's accretion disk
The infinitely dense core of a black hole
What do we call the radiation that is theorized to be emitted by black holes?
Gamma radiation
X-ray radiation
Electromagnetic radiation
Hawking radiation
In what way does a black hole affect time for an observer near its event horizon?
Time speeds up
Time slows down
Time stays constant
Time reverses
What is the name of the boundary around a rotating black hole beyond which particles cannot remain in a stable orbit?
Photon sphere
Event horizon
Ergosphere
Accretion disk
What is the most accurate description of a black hole's event horizon?
A solid surface
An invisible sphere
A brightly glowing edge
A large planetary body
How is the mass of a black hole typically measured?
By its gravitational pull on nearby stars
By its brightness
By its size
By its temperature
What is the primary method astronomers use to detect black holes?
Observing visible light emitted by the black hole
Detecting gravitational waves
Measuring radio waves from the black hole
Observing the behavior of nearby matter
What term describes the process by which a black hole pulls in and consumes matter?
Sublimation
Accretion
Diffusion
Radiation
Choose from below
The speed of light in a vacuum
The Lorentz factor, which accounts for time dilation
The distance travelled
The acceleration of the moving object
What happens to the information that falls into a black hole according to the information paradox?
It is destroyed
It is stored in the singularity
It is lost forever
It remains at the event horizon
Which type of black hole is formed by the collapse of a massive star?
Supermassive black hole
Stellar black hole
Primordial black hole
Micro black hole
What is the effect of a black hole's gravity on light passing near it?
Light is absorbed
Light is amplified
Light is bent
Light is unaffected
Which of these is not a type of black hole?
Stellar
Supermassive
Quasar
Intermediate
What is the focus of direct dark matter detection experiments?
Interactions with ordinary matter
Measuring annihilation products
Studying electromagnetic waves
Observing gravitational waves
How are supermassive black holes at the centers of galaxies detected?
By their strong magnetic fields
By the intense light from accreting material
By the size of their event horizon
By their X-ray emissions
What is the term for the path a particle takes as it approaches a black hole but escapes its gravity?
Event horizon
Hyperbolic trajectory
Accretion disk
Photon sphere
What happens to the light emitted from an object as it approaches the event horizon of a black hole?
It blueshifts
It redshifts
It becomes brighter
It remains unchanged
What is the Penrose process in relation to black holes?
A method to measure a black hole's mass
A process to extract energy from a rotating black hole
The formation of a black hole's event horizon
1. The collapse of a star into a black hole
How does the concept of frame dragging relate to black holes?
It describes the bending of light around a black hole
It refers to the time dilation effects near a black hole
It explains the twisting of spacetime around a rotating black hole
1. It denotes the increase in gravitational force near a black hole
Which phenomenon occurs when two black holes merge?
An explosion of matter
The creation of a larger black hole
The destruction of both black holes
1. The formation of a neutron star
What determines the Hawking radiation temperature of a black hole?
Its charge
Its spin
Its mass
Its age
Which of the following phenomena is associated with the extreme gravitational pull of black holes?
Doppler Effect
Redshift
Tidal forces
Blue shift
What is the significance of the Kerr metric in black hole theory?
It describes a non-rotating black hole
It describes a rotating black hole
It determines the temperature of a black hole
It measures the gravitational pull of a black hole
What phenomenon occurs when a black hole's tidal forces stretch and compress an object?
Frame dragging
Spaghettification
Time dilation
Redshift
Which force primarily governs the formation of black holes?
Gravitational force
Electromagnetic force
Strong nuclear force
Weak nuclear force
What is the main implication of the information paradox in black hole physics?
Black holes can grow infinitely large
Information that falls into a black hole may be lost forever
) Black holes can emit gravitational waves
Black holes can merge to form larger black holes
What is the ergosphere of a rotating black hole?
The region outside the event horizon where objects cannot remain in place
The singularity at the center of the black hole
The outer edge of the accretion disk
1. The boundary within which light cannot escape
Which mathematical tool is often used to describe the geometry of spacetime around black holes?
Euclidean geometry
Linear algebra
Differential geometry
Matrix Theory
What is a ring singularity, and in which type of black hole is it found?
A point-like singularity found in non-rotating black holes
A ring-shaped singularity found in rotating black holes
A linear singularity found in binary black holes
1. A spherical singularity found in supermassive black holes
How is the event horizon area of a black hole related to its entropy?
) The event horizon area is proportional to the black hole's entropy
The event horizon area is inversely proportional to the black hole's entropy
The event horizon area is unrelated to the black hole's entropy
The event horizon area is equal to the black hole's entropy
Which term describes the hypothetical tunnels connecting two different points in spacetime, sometimes associated with black holes?
Time loops
Wormholes
Cosmic strings
Gravitational bridges
How does Hawking radiation theoretically affect the mass of a black hole over time?
It causes the black hole to lose mass
It increases the black hole's mass
It has no effect on the black hole's mass
It stabilizes the black hole's mass
Which of the following statements correctly describes time dilation?
Time passes slower for a moving observer relative to a stationary one
time passes faster for a moving observer relative to a stationary one.
Time is independent of an object's speed.
Time dilation only occurs in strong gravitational fields.
In special relativity, what happens to time for an observer moving at close to the speed of light relative to a stationary observer?
Time passes at the same rate for both observers.
Time passes faster for the moving observer.
Time passes slower for the moving observer.
Time stops completely for the moving observer.
What does gravitational time dilation predict about time near a massive object like a planet or black hole?
Time passes faster the closer you are to the massive object.
Time passes slower the closer you are to the massive object.
Time does not change based on gravity.
Time stops completely at the surface of a massive object.
What was the result of the Hafele-Keating experiment (1971)?
Clocks on planes experienced no difference compared to clocks on Earth.
Clocks on planes ran faster compared to those on Earth.
Clocks on planes ran slower compared to those on Earth due to both velocity and gravity.
Clocks on planes showed no correlation with the time on Earth.
Which of the following technologies must account for time dilation to function accurately?
Telephones
GPS satellites
Microwaves
Household clocks
What is the no-hair theorem in black hole physics?
Black holes cannot lose mass
Black holes are characterized only by mass, charge, and angular momentum
Black holes do not emit any radiation
Black holes have no magnetic fields
In the twin paradox, the twin who travels at near-light speed will:
Age faster than the twin who stays on Earth.
Age slower than the twin who stays on Earth.
Have the same age as the twin who stays on Earth.
Be unaffected by time dilation.
Which equation is used to calculate time dilation due to relative motion in special relativity?
What happens to time as an object approaches the event horizon of a black hole?
Time speeds up.
Time appears to freeze from the perspective of an external observer
Time stops completely for the object
Time passes faster the closer the object gets to the event horizon
According to special relativity, which of the following will cause the greatest time dilation effect?
A car moving at 50 km/h.
A spaceship travelling at 90% the speed of light.
A jet flying at 1,000 km/h
A satellite in orbit around Earth.
Approaching the event horizon of a black hole, what would you see looking back?
Rest of the universe get drastically slower.
Rest of the universe speed up drastically.
Time seems to pass normally for others.
Nothing
Why do GPS satellites need to account for time dilation effects?
They are in motion relative to Earth, experiencing special relativity time dilation.
They are farther from Earth's gravitational field, experiencing weaker gravity, leading to general relativity time dilation
Both special and general relativistic time dilation effects occur.
Time dilation does not affect GPS satellites.
Person A has a radioactively decaying substance and is stationary, and Person B has the same substance but is moving at relativistic speeds. From the stationary observer’s POV, after a certain time how would the remaining masses of the substances compare?
Person A has less substance left than Person B.
Person A has more substance left than Person B.
Person A and B have the same mass left.
Person B has no substance left.
Which of the following is true according to the theory of special relativity?
Events that are simultaneous in one reference frame are also simultaneous in another.
Events that are simultaneous in one reference frame may not be simultaneous in another moving reference frame.
Time is independent of the observer's motion.
Time dilation does not affect simultaneity.
Which of the following objects experiences the least gravitational time dilation effect?
A person standing on Earth.
A satellite orbiting Earth at 500 km altitude.
An astronaut in orbit around the Moon.
A spaceship near a supermassive black hole.
In the twin paradox, why does the twin who travels at a high speed age slower than the one who stays on Earth?
The travelling twin experiences more gravity.
The travelling twin experiences time dilation due to high velocity.
The travelling twin accelerates to high speed, which causes time dilation.
The travelling twin is exposed to more radiation.
Which of the following would you expect to experience the least time dilation effect in everyday life?
A person flying in a commercial airoplane.
A person sitting in a parked car.
A person in low orbit around the Earth.
A person moving at 99% the speed of light.
What does length contraction in special relativity refer to?
Objects appear longer in motion
Moving objects appear shorter along the direction of motion
Moving objects appear shorter in all directions
Moving objects expand in the direction of motion
The second postulate of special relativity states that the __________ is constant for all observers, regardless of their motion relative to the source.
Gravitational force
Speed of light
Passage of time
Mass of objects
If a spaceship travels at near-light speed, how would communication with Earth appear to work from the spaceship's perspective?
Signals from Earth would be received more quickly
Signals from Earth would appear to be delayed.
No signals would be received.
Signals from Earth would be received instantaneously.
Who proposed the theories of special and general relativity, which form the basis for understanding time dilation?
Isaac Newton
Albert Einstein
Galileo Galilei
Nikola Tesla
Which of the following is true according to Einstein's theory of relativity?
The speed of light varies depending on the observer’s motion
The laws of physics are the same in all inertial frames of reference
Time flows faster at higher speeds
A moving object gains mass as it approaches the speed of light
What factor primarily determines the extent of gravitational time dilation near a massive object?
The velocity of the object
The distance from the centre of the massive object.
The shape of the massive object.
The density of the massive object.
Why do atomic clocks on satellites measure time differently than identical clocks on Earth?
Satellites are moving relative to Earth, causing velocity-based time dilation.
Satellites experience weaker gravity, causing gravitational time dilation.
Both velocity-based and gravitational time dilation occur.
Neither velocity nor gravity affects the clocks.
The __________ of spacetime in general relativity is caused by mass and energy.
Curvature
Length Contraction
Inertia
Expansion
Choose >:)
0.1
0.3
0.4
0.6
The __________ factor quantifies the effects of time dilation and length contraction in special relativity.
Lorentz
Einstein
Intertial
Gravitational
Which factor increases in value as an object approaches the speed of light?
Mass of the object
Time elapsed for the object
Energy required to accelerate the object
Distance travelled by the object
Time dilation is a relative effect. This means it depends on:
The absolute speed of the observer.
The observer’s acceleration.
The relative motion between two observers.
The size of the object being observed.
Where would time pass more quickly for an observer?
On the surface of a neutron star.
In orbit around Earth.
On the surface of Earth.
In deep space far from any massive object
What role does the speed of light (cc) play in time dilation?
It sets the limit for how fast time can pass.
It is a constant that ensures time dilation effects are uniform.
It determines the maximum energy an object can have.
It ensures time and space are intertwined.
Why do we observe time dilation in the light from distant galaxies?
The galaxies are moving rapidly away from us, causing velocity-based time dilation.
The light passes through strong gravitational fields
Both motion and gravity cause time dilation in cosmic observations.
The light is scattered and loses energy, creating the illusion of time dilation.
At what speed do the effects of special relativity-based time dilation become significant?
Speeds exceeding 100 km/h.
Speeds comparable to the speed of sound.
Speeds approaching the speed of light.
Any speed greater than 1,000 km/h.
In this equation, why must v<c?
Because v>c would make t’ undefined
Because v=c results in no time dilation.
Because v>c results in infinite time.
Because v<c has no physical meaning.
If astronauts A travels right at 0.4c, and astronaut B travels left at 0.3c, when astronaut A shines a laser towards astronaut B, how fast will the light from the laser be travelling to him from astronaut B’s perspective?
c
0.7c
0.3c
0
