Chapter 39435Neither of these examples violates the principle of relativity. Both cases are describing a pointof intersection: in the first case, the intersection of two cards and in the second case, the intersectionof a light beam with a screen. A point of intersection is not made of matter so it has no mass, andhence no energy. A bug momentarily at the intersection point could yelp, take a bite out of one card,or reflect the light. None of these actions would result in communication reaching another bug sosoon as the intersection point reaches him. The second bug would have to wait for sound or light totravel across the distance between the first bug and himself, to get the message.As a child, the author used an Erector set to build a superluminal speed generator using theintersecting-cards method. Can you get a visible dot to run across a computer screen faster thanlight? Want’a see it again?
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This note was uploaded on 12/14/2011 for the course PHY 203 taught by Professor Staff during the Fall '11 term at Indiana State University .