Confusion regarding an exercise problem in SR

Asked Dec 17 '19 at 00:34

Active Dec 17 '19 at 00:49

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Following is an exercise question from Relativity SPECIAL, GENERAL, AND COSMOLOGICAL SECOND EDITION, Wolfgang Rindler

2.6. Consider the usual two inertial frames S and S' in standard configuration. In S' the standard lattice clocks all emit a ‘flash’ at noon. Prove that in S this flash occurs on a plane orthogonal to the x-axis and traveling in the positive x-direction at (de Broglie) speed $c^2/v$.

I assume that the flashes are of light which means that they should be travelling at the speed of light, so I don't understand how to prove it to be $c^2/v$.
Again I assume that v here is the velocity of the reference frame S' with respect to S. Is it correct?

Can someone just explain what the question wants me to do?

edited Dec 17 '19 at 00:49

asked Dec 17 '19 at 00:34

SK Dash

1,848

Please use superscripts to make your question clear. – G. Smith Dec 17 '19 at 00:39
Don’t expect readers to figure out what $c2$ is supposed to mean. – G. Smith Dec 17 '19 at 00:40
Just forget about the "(de Broglie)" and it's a normal exercise in special relativity. – knzhou Dec 17 '19 at 00:42
@knzhou So does it mean that the flash is travelling at $c^2/v$ is what we have to prove? – SK Dash Dec 17 '19 at 00:43
Related : About de Broglie relations, what exactly is E ? Its energy of what?. – Frobenius Dec 17 '19 at 06:33
What the question wants you to do is prove that in S this flash occurs on a plane orthogonal to the x-axis and traveling in the positive x-direction at (de Broglie) speed $c^2/v$. – WillO Dec 17 '19 at 06:55

Confusion regarding an exercise problem in SR

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