Lesson 1: Relativity  What is it?
Note: For Fermilab's Time Dilation Challenge and The Relativity Game, you need Shockwave. You may painlessly Download Shockwave here if you do not have it.Lesson 2: Time Dilation
Lesson 3: Length Contraction
Lesson 4: Relativistic Mass

Question Answer Choice d  3.46 light years: Excellent work! You got it. The ship, seeing Alpha Centuri traveling at it with a speed of 50% c, believes that light would make the trip in half the time it took the ship (light travels twice as fast). If we divide the time for the ship to make the trip in half, we get: (0.5)(6.928202 years) = 3.46 years. Therefore, the mover believes that Alpha Centuri is 3.46 light years away from earth, not 4.0 light years as measured in the stationary frame. Lesson 3: Length Contraction

© Brian Wegley, 1998
Comments and suggestions can be sent by email to Brian Wegley of Glenbrook South High School.. This page last updated on 7/23/98.