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Year 12 - Special Relativity Flashcards | StudBud
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Year 12 - Special Relativity
Year 12 - Special Relativity
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A quiz on special relativity
Flashcards
38 cards
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Questions
38
Answers
1
Which is the correct formula for length contraction?
l = γlo
lo = γl
l = lo/γ
lo = l/γ
2
Which is true for the Lorentz factor?
γ < 1
γ > 1
γ ≤ 1
γ ≥ 1
3
The proper time for an event moving at 0.99c relative to Earth is 21 mins. Which is true?
The time is about 28 mins to Earth
The time is about 147 mins to Earth
The time is about 3 mins to Earth
The time is about 7 mins to Earth
4
Relativistic kinetic energy is calculated from:
(γ-1)moc2
(γ-1)mov2
γmoc2
1/2mov2
5
What direction is motion 2 relative to motion 1?
Upwards right
Downwards left
Upwards left
Downwards right
6
A and B are measuring the length of a stick which is moving relative to B. Which is true?
B could be measuring the proper length
A could be measuring the proper length
7
How did Michelson and Morley try to find the ether?
Refraction of lasers
Interference of lasers
Diffraction of lasers
8
A body is travelling at 0.4c. What is the Lorentz factor?
About 4
About 2
About 1.5
About 1
9
Which of the following is false about Albert Einstein?
He never wore socks
He married his cousin
He was offered to be the Israeli president
He won a Nobel prize for his theory on Special Relativity
10
A bus is moving at 9 m/s. A passenger is walking at 3 m/s towards the driver. Which is true?
A person on the road sees the passenger moving at 12 m/s.
A person on the road sees the passenger moving at 6 m/s.
11
Proper length is the longest possible length for a given object.
True
False
12
Which symbol is used for the Lorentz factor?
π
μ
Δ
γ
13
Galilean transformations are also known as:
Non-relativistic transformations
All of the above
Classical transformations
Newtonian transformations
14
Simultaneous events in one FOR are not simultaneous in another FOR. This is known as:
General relativity
Galilean transformations
Simultaneity
15
A bus is moving at 9 m/s. A passenger is walking at 3 m/s towards the back. Which is true?
A person on the road sees the passenger moving at 6 m/s.
A person on the road sees the passenger moving at 12 m/s.
16
A and B are timing the duration of an event. B is at rest relative to the event. Which is true?
B measures proper time
Both measure proper time
A measures proper time
17
Relativistic transformations are also known as ______________ transformations.
Lorentz
Einstein
18
Proper time is the longest possible time for an event.
True
False
19
It is possible to distinguish between two inertial reference frames.
True
False
20
An electron from rest is accelerated through a potential difference of 300kV. What is its KE?
less than 300 keV
300 keV
more than 300 keV
21
Which statement is true about the speed of light?
It depends on the motion of the observer
It depends on the motion of the source
It is constant for all inertial observers
22
Special relativity consists of two postulates. Which one is
not
a postulate?
The laws of physics change in different inertial FOR
The speed of light is the same for all inertial observers
The laws of physics are unchanged in different inertial FOR
23
A proton from rest is accelerated through a potential difference of 300kV. What is its KE?
300 keV
300 J
300 eV
300 kJ
24
Simultaneity can be explained by:
Proper time
The constancy of c
Galilean transformations
Proper length
25
What is the correct formula for relativistic mass?
m = mo/γ
m = γmo
mo = γm
mo = m/γ
26
How do you convert from electronvolts (eV) to Joules (J)?
Divide by the charge of an electron/proton (e)
Multiply by the charge of an electron/proton (e)
27
Proper time is given the symbol:
t
to
28
An inertial frame of reference is one which is:
Constant velocity only
At rest or constant velocity
Accelerating
At rest only
29
A pipe is moving at 0.99c relative to Earth. The proper length is 14 cm. Which is true?
The length is about 1 cm for Earth
The length is about 98 cm for Earth
The length is about 2 cm for Earth
The length is about 7 cm for Earth
30
An alpha from rest is accelerated through a potential difference of 300kV. What is its KE?
less than 300 keV
more than 300 keV
300 keV
31
E = m
o
c
2
is the formula for:
Kinetic energy
Total energy
Rest energy
32
Which formula is correct for time dilation?
to = γt
t = γto
33
Which of the following does
not
get increased by the Ɣ factor at high speeds?
Energy
Momentum
Length
34
E = γm
o
c
2
is the formula for:
Total energy
Kinetic energy
Rest energy
35
What was the purpose of the Michelson-Morley experiment?
To determine the existence of the medium for light (ether)
To calculate the speed of light in different mediums
To prove Special Relativity wrong
36
A body is travelling at 0.99c. What is the Lorentz factor?
About 2
About 7
About 200
About 1
37
What direction is motion 1 relative to motion 2?
Upwards left
Upwards right
Downwards right
Downwards left
38
For what conditions are Galilean transformations valid?
Speeds equal to c
Speeds much less than c
Speeds close to c
