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Chap_29_Disc[1]

Chap_29_Disc[1] - 29-43 An electron moves to the right in a...

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29-43: An electron moves to the right in a laboratory accelerator with a speed of 0.84c. A second electron in a different accelerator moves to the left with a speed of 0.43c relative to the first electron. Find the speed of the second electron relative to the lab. Picture the Problem : One electron (1) travels with a velocity 13 0.84 vc relative to the laboratory (3). The second electron (2) travels in the opposite direction at a velocity 21 0. v 43 c   relative to the first electron. Strategy: Use equation 29-4 to calculate the velocity of the second electron relative to the laboratory. 23 , v Solution: Solve equation 29-4 for the speed of the second electron relative to the lab:    21 13 23 2 21 13 0.43 0.84 0.64 1 0.43 0.84 1 cc vv vv c    Insight: In the laboratory the second electron is traveling in the same direction as the first electron, but at a slower speed. 29-59: What minimum energy must a gamma ray have to create an electron-antielectron pair?

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Chap_29_Disc[1] - 29-43 An electron moves to the right in a...

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