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by BlastRoom
Practice deciding event order and simultaneity in different inertial frames.
#physics
20 questions
One question set, multiple game modes. Tap any game to see it in action. Not sure which to pick?
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Outrun the snow together.
Earn blasts, then hunt the other team.
Answer to earn energy, then climb.
The class blasts through walls together.
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Sell tours. Nice, standard, or a total scam.
Answer, restock, and serve the rush.
More correct answers pulls the rope your way.
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Answer, then tap to leap the frozen ridge.
In the figure, a centered lamp flashes in a carriage moving right relative to the platform. According to the platform observer, which wall is reached first?
A passenger is at rest in the carriage shown, with the lamp exactly halfway between walls F and R. In the passenger's frame, what happens when the lamp flashes?
The figure shows a carriage moving left relative to the platform. F is the left wall and R is the right wall. For a platform observer, which wall does the centered flash reach first?
Front and rear lamps flash simultaneously in the platform frame as a carriage moves right. The passenger is at the carriage center. Which signal reaches the passenger first, and what does she infer?
Two platform-end flashes reach the platform middle together while a carriage moves right. What does the passenger moving with the carriage conclude about the flashes?
The figure compares the carriage and platform frames for the same centered-lamp flash. Which comparison is correct?
The timeline shows left strike L and right strike R simultaneous in the platform frame. The carriage moves right, toward R. What is the order in the carriage frame?
A carriage observer records the rear and front wall-hit events as simultaneous while the carriage moves right relative to the platform. What does the platform timeline show?
The platform timeline marks left and right platform strikes as simultaneous. A carriage moves left, toward the left strike. What order belongs on the carriage timeline?
The carriage timeline shows rear and front lamps emitting together in the carriage frame. The carriage moves right. Which platform-frame order is correct?
Two events 600 m apart along an east-west track are simultaneous in the lab. A spaceship moves east. What does whether they are simultaneous in the spaceship frame depend on?
Which pair of events would every inertial observer agree are simultaneous?
A spark at one detector causes a signal light at the same detector 2 ns later. A rocket moves relative to the lab. What must all inertial observers agree on?
In special relativity, what remains invariant for inertial observers when they measure light traveling in vacuum?
The platform records two flashes as simultaneous at the same east-west position but different north-south positions. A carriage moves east. What does the carriage frame say?
A student says relativity of simultaneity is only an illusion caused by one flash's light having a shorter path to the eye. What is wrong with that claim?
Two inertial observers moving relative to each other disagree about which separated flash happened first. Which statement best matches special relativity?
Does relativity of simultaneity allow an effect to happen before its cause?
A passenger at the center of a carriage receives the front flash before the rear flash and is equidistant from both end marks in her frame. Why may she say the front flash happened first?
Platform observers say two clocks synchronized in the carriage frame are not synchronized. What is the best explanation?
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50 questions
