Which door does the observer see open first to let the light out?

person in the train sees both the doors open together, The person outside the train sees the back door open first

Describe what is meant by the sentence, “Simultaneity is not absolute.”

Events may not appear simultaneous in all frames of reference

measured by observer at rest to event (only needs one clock)

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Simultaneity and Relativity of time

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QCAA 9.3 and 9.4

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Questions 13

Answers

1
t is
relativistic time measured by external observer
proper time measured by external observer
relativistic time measured by observer at rest to event
proper time measured by observer at rest to event
2
The observer outside the train is correct
False
True
3
What does this expression represent:
time dilation
Lorentz factor
length contraction
relativistic energy
4
to is
relativistic time measured by external observer
relativistic time measured by observer at rest to event
proper time measured by external observer
proper time measured by observer at rest to event
5
Which door does the observer see open first to let the light out?
The person outside the train sees both the doors open together
The person in the train sees the back door open first
person in the train sees both the doors open together
The person outside the train sees the back door open first
6
A train moving at 0.9c approaches a light flashing once/sec. A person on the train measures the time between flashes as
<1s
IDK
>1s
=1s
7
For the observer on earth, the rocket ship measures proper time (to)
False
True
8
Moving clocks run slow (with respect to me)
True
False
9
Describe what is meant by the sentence, “Simultaneity is not absolute.”
The laws of physics may differ in different inertial reference frames
The speed of light is not the same in all frames of reference
Events may appear simultaneous in all frames of reference
Events may not appear simultaneous in all frames of reference
10
Proper time to is
measured by observer at rest to event (only needs one clock)
measured by observer at rest to event (needs 2 clocks events in 2 places)
measured by external observer (only needs one clock)
measured by external observer (needs 2 clocks as events in 2 places)
11
Time dilation is the difference in time interval between 2 events as measured by observers moving relative to each other
False
True
12
The observer on the train is correct
True
False
13
Because v is always less than c, this value is always
>1
IDK
=1
<1

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