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| - | - Students analyze a standard problem involving the lifetime of cosmic rays. | + | - This small group activity is designed to help upper division undergraduate students work out the lifetime of cosmic rays taking relativistic effects into account. |
| + | - Students work in small groups and use hyperbolic trigonometry and spacetime diagrams to calculate the lifetime of incoming cosmic rays. | ||
| + | - The entire class wrap-up discussion summarizes group findings and difficulties, helping students gain a geometric perspective of time dilation and length contraction. | ||
