They shine the beam of the torch across the carriage and time how long it takes.

Imagine a person in a train with a torch (figure 1).

Verkkotime dilation is a moving clock running slow because time itself has been affected, for example because the clock is moving close to the speed of light.

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Verkkodepicts an experiment at massachusetts institute of technology and on top of mt washington, new hampshire, using radioactive decay of cosmic ray.

Verkkoa thought experiment on time dilation.

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