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Physics Einstein's theory of relativity and Expanding Universe Flashcards | StudBud
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Physics Einstein's theory of relativity and Expanding Universe
Physics Einstein's theory of relativity and Expanding Universe
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Revision for #Einstein's theory of special relativity
Flashcards
30 cards
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Practice quiz
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Questions
30
Answers
1
What is the proper time of an object?
The time measured by the observer
The time dictated by the teacher
The time measured inside the frame of reference
The time measured by an outside observer
2
What appears to happen to an objects mass as it increases in speed?
Stays the same
Multiplied by 1/2
Decrease
Increase
3
What is an inertial frame of reference?
Any frame that is not undergoing acceleration.
A stationary frame of reference
Where ever the observer is
An accelerating frame of reference
4
At the moment of the Big Bang, about 13.8 billion years ago, the universe was ...
hot and dense like the center of Earth
hot and dense like the center of a star
scientists have no idea
cold and dense like the center of a star
5
What did Vesto Slipher discover?
dark matter
dark energy
that our galaxy was a barred-spiral
that surrounding galaxies light was red-shifted
6
When travelling towards a light source what do you observe?
c is lower
Increase in light frequency
You add your speed onto c
No change
7
Is the speed of light (in a vacuum) the same for all viewers?
Yes
No
8
To an observer on Earth, what does an object moving near the speed of light appear to do?
No change
Shorten
Lengthen
Disappears
9
How old is the universe?
About 20 Billion Years Old
About 14 Billion Years Old
None of the above
About 5 Billion Years Old
10
Who developed the theory of relativity?
Augustus Einstein
Albert Einstein
Anwar Einstein
Alfred Einstein
11
What is the first postulate of General Relativity
The speed of light is constant
You can't tell the difference between gravity and acceleration
Gravity is the result of the warping of space and time
The laws of Physics are invariant in all inertail frames
12
What happens to time when it nears the speed of light?
Slows down
Remain the same
Fluctuates
Speeds up
13
George Lemaitre mentioned that the universe started from a single point. He also worked as a....
Doctor
Chemist
Priest
Science teacher
14
What is the primary cause of the perihelion precession of Mercury’s orbit?
The influence of the Sun’s radiation pressure
Tidal forces from the Moon
General relativity effects on spacetime curvature
Gravitational interactions with cats
15
What was Einstein's
second
postulate that he based his special relativity theory on?
Previous calculations were to elegant to ignore
There is a universal zero velocity
Speed of light is a constant
There is no absolute velocity
16
Wilson and Penzias discovered...
CMB
Telescope
CBM
Redshift
17
What happens as a ship approaches the speed of light?
It will reach the speed of light
Length decreases and T slows exponentially.
Length decreases and T slows linearly.
Length increases and T speeds up exponentially
18
Second postulate of General Relativity
Gravity is the result of the warping of space and time
The speed of light is always the same
You can't tell the difference between gravity and an equivalent force
The speed of light is slower if the light is dimmer
19
What was Einstein's
first
postulate that he based his special relativity theory on?
Speed of light is a constant
Physical laws have the same mathematical form for all frames of reference
Previous calculations were to elegant to ignore
There is a universal zero velocity
20
How can we describe Cosmic Distance Ladder?
Is fake
Can be used to find increasing distances by "climbing" rungs of steps
Does not include Type 1A Supernovae
Uses Cepheid Variables for the greatest distances
21
Apparent Brightness
The brightness of a star as seen from earth
The brightness of a star when looking through a telescope
Brightness of a star when standing upside in the woods
Brightness of a star if a standard distance from earth
22
Black holes are called “black holes” because:
No one can get close enough to turn the lights on
They only give off black light
They absorb all spectrum of light
They are permanently shaded from the Sun
23
Which two factors influence a stars apparent brightness?
mass and its distance from us
size and luminosity
luminosity and its distance from us
its mass and size
24
What is absolute brightness?
a measure of the actual luminosity of a star
the orange red layer above the sky
the boundary between two layers
the wide outermost layer of the sun
25
What is the proper length of an object?
The length measured inside the frame of reference
The length measured by an outside observer
The length dictated by the teacher
The length measured by the observer
26
Which part of the Theory of Relativity includes the equation E=mc^2?
Special Theory
General Theory
27
What is Gravitational Lensing?
Bending of light
Turning Gravity into a lense
Interference of light
Reflection of light
28
In the twin paradox, which twin got much older?
both aged drastically
travelling twin
twin on Earth
both stayed the same age
29
What is the speed of light?
3x10^8km/h
2.78x10^8m/s
3km/h
3x10^8m/s
30
Hurtsprung Russel Diagrams compare the temperature and ____ of a star
luminosity
mass
size
temperature
