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# Manfra7 - Course Business PHYS342 Lecture 7 2nd problem set...

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Unformatted text preview: Course Business: PHYS342 Lecture 7 2nd problem set due this Friday. Once graded problems set are returned and solutions posted, No late problem sets can be accepted. Each day the problem set is late without an authorized extension is -10 points Detecting muons to see time dilation It takes 6.8 ms for the 2000-m path at 0.98c, about 4.5 times the muon lifetime. So, without time dilation, of 1000 muons, we expect only 1000 x 2-4.5 = 45 muons at sea level. In fact, we see 542, in agreement with relativity! And how does it look to the muon? Lorentz contraction shortens the distance! Since 0.98c yields γ = 5, instead of moving 600 m on average, they travel 3000 m in the Earth’s frame. 2.9: Space-time When describing events in relativity, it’s convenient to represent events with a space-time diagram . In this diagram, one spatial coordinate x , specifies position, and instead of time t , ct is used as the other coordinate so that both coordinates will have dimensions of length....
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## This note was uploaded on 04/23/2011 for the course PHYS 342 taught by Professor Staff during the Spring '08 term at Purdue.

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Manfra7 - Course Business PHYS342 Lecture 7 2nd problem set...

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