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If you set your watch by the sound of a ...

If you set your watch by the sound of a distant siren, will it go fast or slow ?

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Sound from the distant siren takes time to reach us. Thus, our watch becomes slow by as much time as the time taken by sound to reach us. For example, if the siren sounds 1.30 pm and sound takes 3 seconds to reach us, our watch which has been set after listening to the siren at 1.30 pm is slower by 3 seconds.
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