length contraction and muon decay

Quiz
•
Physics
•
12th Grade
•
Easy
stephanie workman
Used 1+ times
FREE Resource
17 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
A student is travelling at 0.7 c to a distant planet that is stationary relative to earth. They caculate the journey based on their speed and travel distance and find that the journey was 14 lightyears (8.23E18 miles). What distance is the journey from the perspective of the students friends and family back on earth.
19.6 Ly
20.5 Ly
30.9 Ly
36.5 Ly
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
A student traveling at 0.7c has a spaceship which is 250 meters long according to his measurement, how long would the ship have appeared to an observer back on earth.
178.5 m
153.2 m
139.6 m
85.6 m
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
A space alien is planning a trip to invade earth. He knows that earth is 7 light years (4.115E13 miles) away from him, when he is stationary on his planet( which is stationary with respect to earth). How long will his journey appear to him when he reaches his top speed of 0.95c?
2.19 ly
4.72 ly
0.89 ly
5.63 ly
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
In which direction does the contraction of length take place?
In a random direction
In the direction of travel
In all directions
In the opposite direction of travel
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the definition of length contraction?
The change in color of an object that is moving relative to an observer
The decrease in width of an object that is moving relative to an observer
The apparent decrease in length of an object that is moving relative to an observer
The increase in length of an object that is moving relative to an observer
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What happens to the length of an object as it approaches the speed of light?
It decreases
It remains the same
It becomes infinite
It increases
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
The proper length is the distance between two points whose positions are measured by an observer at rest with respect to the two points.
True
False
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