Question

# Alarm clock 1 is positioned at x = -d and alarm clock 2 at x = +d in reference frame A. According to a clock in reference frame A, both go off at t = 0. An observer in reference frame B, which is moving relative to A, measures alarm clock 2 as going off first. In what direction is B moving relative to A?

Solution

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Information:

In this problem we are given a scenario as depicted in the diagram below:

We have two clocks in reference frame A at locations $d$ and $-d$, in this reference frame the clocks are triggered simultaneously but the observer in reference frame B (which is moving relative to frame A) sees the clock at position $d$ go off first. We need to determine the direction the reference frame B is moving to.

Strategy:

For this, we will use our knowledge of general physics and the law of causality.

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