Identify the following pairs of events as spacelike, time- like, or lightlike. ?

Question

Identify the following pairs of events as spacelike, time- like, or lightlike.
? two firecrackers exploding simultaneously at opposite ends of a room A? timelike B? lightlike C? spacelike
? a muon detected at the top of a 2000 m mountain and a muon detected on the ground 78 ns later
A? timelike B? lightlike C? spacelike
? opening your apartment door in DC and a vase falling off a shelf in California 5 minutes later
A? timelike C? spacelike B? lightlike
? pulling the trigger of a rifle and the bullet hitting the target 50 m away
A? timelike B? lightlike C? spacelike
? a firecracker exploding under your desk, and then another exploding there 4 µs later

A? timelike C? spacelike
B? lightlike

Explanation / Answer

1. [ A ] time like 2. [c.] space like 3. [ A ] time like 4. [ c ] space like 5. [ A ] time like

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