You aretraveling in a spaceship at a speed of 0.84 c away fromEarth. You send a

Question

You aretraveling in a spaceship at a speed of 0.84c away fromEarth. You send a laser beam toward Earth traveling at velocityc relative to you. What do observers on the Earth measurefor the speed of the laser beam?
c

You aretraveling in a spaceship at a speed of 0.84c away fromEarth. You send a laser beam toward Earth traveling at velocityc relative to you. What do observers on the Earth measurefor the speed of the laser beam?
c

You aretraveling in a spaceship at a speed of 0.84c away fromEarth. You send a laser beam toward Earth traveling at velocityc relative to you. What do observers on the Earth measurefor the speed of the laser beam?
c

You aretraveling in a spaceship at a speed of 0.84c away fromEarth. You send a laser beam toward Earth traveling at velocityc relative to you. What do observers on the Earth measurefor the speed of the laser beam?
c

You aretraveling in a spaceship at a speed of 0.84c away fromEarth. You send a laser beam toward Earth traveling at velocityc relative to you. What do observers on the Earth measurefor the speed of the laser beam?
c

You aretraveling in a spaceship at a speed of 0.84c away fromEarth. You send a laser beam toward Earth traveling at velocityc relative to you. What do observers on the Earth measurefor the speed of the laser beam?
c

Explanation / Answer

Remember Einstein's Second Postulate of Relativity, which saysthat the speed of light in a vacuum remains the same for allinertial reference frames. This is regardless of any velocity,either that of the emitting source of the light or theobserver. The answer is c = 3.00 x 108 m/s!

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