A spaceship flies past earth with a speed of 0.990c (about 2.97 EXP 8 m/s) relative to earth. A high intensity signal light (perhaps a pulsed laser) blinks on and off; each pulse lasts 2.00 EXP-6 seconds) as measured in the spaceship. At a certain instant the ship is 1000 km above the observer on earth and is traveling perpendicular to the line of sight of the observer. Let AT be the time interval measured in the earth's frame of reference and At be the time interval in the frame of reference of the spaceship. Let c=3.00 EXP8 m/s.

A spaceship flies past earth with a speed of 0.990c (about 2.97 EXP 8 m/s) relative to earth. A high intensity signal light (perhaps a pulsed laser) blinks on and off; each pulse lasts 2.00 EXP-6 seconds) as measured in the spaceship. At a certain instant the ship is 1000 km above the observer on earth and is traveling perpendicular to the line of sight of the observer. Let AT be the time interval measured in the earth's frame of reference and At be the time interval in the frame of reference of the spaceship. Let c=3.00 EXP8 m/s.