You are in the magic school bus alone. For some reason, you decide to shine a laser straight up. The bus is at a height h = 3.50 m, excluding the wheels, and is travelling at a speed v = 0.800c. Now, your crush is on a car at rest, watching as the bus goes right past.
(a) What is the time it takes for the light in your perspective to bounce from the laser to the top of the bus, then to the floor, and back to the laser?
(b) Do this same calculation, but for your crush’s perspective. Hint: Light travels at the same speed from any perspective.
(c) What is the ratio of the time from your crush’s view and that of your view?
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