- #1
freshnfree
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A torch (flashlight US) is positioned on a train going at 70kms/hour. Relative to someone standing beside the train track the torch will have a velocity of 70kms/hour since it is on the train. When you switch on the torch, a light beam emanates. However, the light was not actually inside the torch, it emanates from the torch. Light is made of photons. Do the photons exist in the torch or only outside the torch? If so, can it be said that the light beam is also on the train or did it only start to exist outside of the torch and therefore was never "on the train"?
Alessandra
Alessandra