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Modern Physics- Exam 1
Modern Physics- Exam 1
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1
The worldline of light makes an angle of ____ with the horizontal
60
30
45
15
2
When should you use the time dilation equation?
when your velocity is small
the events do NOT occur at the same location in a frame
the events occur at the same location in a frame
when your velocity is very close to c
3
What values can ß (beta) be?
0 to infinity
-infinity to infinity
0 to 1
1 to infinity
4
Simultaneity depends on your reference frame
True
False
5
You can always use the Lorentz transformation
False
True
6
Which of these statements is false?
timelike events can be made coincident but not simultaneous
the worldline of light is outside the light cone
spacelike events can be made simultaneous but not coincident
causally unconnected events can never become causally connected
7
It is not possible to design an experiment to determine if one is in uniform motion versus not in motion
False
True
8
What is a good approximation for c?
1ft/s
1ft/ps
1ft/ms
1ft/ns
9
It is not possible to design a experiment to determine if you're in an inertial reference frame
False
True
10
Which of these is not an element of classical physics?
electromagnetism
motion
relativity
thermodynamics
11
You can always use the time dilation equation
True
False
12
The special principle of relativity states that physical laws should be the same in every inertial frame of reference
True
False
13
Which two are correct?
The man in the cart is not in an inertial frame
The man in the cart is in an inertial frame
The man by the tree is in an inertial frame
The man by the tree is not in an inertial frame
14
What is the speed of light exactly?
299, 792, 459 m/s
299, 792, 458 m/s
I don't know I'm just going to use 3x108 m/s because it's easier
299, 792,456 m/s
15
What is the principle of the constancy of the speed of light?
the speed of light is always c if you're in an a non inertial frame
the speed of light is always c
the speed of light always changes with your reference frame
the speed of light must be a scalar multiple of c
16
General relativity is a theory of how space and time are perceived differently by different observers
False
True
17
When can you use the non-relativistic velocity law
When objects move at or close to the speed of light
When objects move at slow speeds compared to the speed of light
18
Fun question! Which one is true?
Einstein died on pi day
Einstein didn't start talking until he was almost three
Einstein was a bad student
Einstein was left handed
19
Which of these is not required for a reference frame
Position
Origin
Temperature
Clock
20
Fun Question! How many calories does banging your head against a wall for an hour burn?
100
150
50
200
21
In inertial frames, the laws of physics must hold
False
True
22
Which formula is correct?
f=λc
c=ωλ
c=λf
λ=cf
23
What is not an equation for total energy?
E2=(pc)2+(mc2)2
E=k+mc2
E=γmc2
E=mc2
24
Which is NOT one of the three kinds of interval
time like
light like
speed like
space like
25
How many joules(kgm^2/s^2) is one eV equal to?
1.6 x 10-13
1.6 x 10-15
1.6 x 10-16
1.6 x 10-19
26
A light-year is a time measurement
False
True
27
The Proper Frame is the frame in which two events occur at the same time
True
False
28
Fun Question! What is a group of frogs called?
an army
a swarm
a band
a leap
29
Proper length is in the frame where the ruler is at rest
True
False
30
If Vxy and Vyz are both equal to c what is Vxz equal to?
c
2/3c
1
c/2
31
What values can γ (gamma) be?
-infinity to infinity
0 to 1
0 to infinity
1 to infinity
32
It doesn't matter how fast you're going if you're moving with a fixed speed along a straight line
True
False
33
What is the formula for intervals? (interval=s)
s2=x2-(ct)2
s2=x2+(ct)2
s2=xt2
s2=x2+(t/c)2
34
If no net force is applied to a ball and it continues to move at a constant speed, then you are in an inertial frame
True
False
