a moving emitter passes point A traveling at .5 c and emits one photon along the direction of travel. At that same instant a freight train traveling at .5 c passes point A in the opposite direction.(adsbygoogle = window.adsbygoogle || []).push({});

Question 1 - two seconds later where is the moving emitter with respect to point A?

Question 2 - two seconds later where is the freight train with respect to point A?

Question 3 - where is the photon at that 2 second point with respect to point A?

Question 4 - where is the photon at that 2 second point with respect to the moving emitter?

Question 5 - where is the photon at that 2 second point with respect to the freight train?

Question 6 - how far apart are the freight train and the moving emitter at that 2 second point?

Question 7 - have the photon and the freight train separated at faster than c ?

This isn`t homework, i`m just trying to understand this stuff.

**Physics Forums | Science Articles, Homework Help, Discussion**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# .5 c

**Physics Forums | Science Articles, Homework Help, Discussion**