A spaceship has a length of 300m, measured in its own reference frame. It is traveling in the positive x direction at a speed of 0.8c relative to the earth. A strobe light at the nose of the ship sends a pulse of light toward the end of the spaceship.
a) As measured in the reference frame of the spaceship, how long does it take this pulse to reach the tail?
b) As measured in the reference frame of the earth, how long does this light pulse take to reach the tail?