A question about Alice and Bob in SR

[MathematicalPhysicist]

It is. But whose time interval? Alice and Bob don't agree on the duration.

When answering the question, think whose clock is responsible for measuring $\Delta t$.

Bob's, because $\Delta t$ is according to his clock.

So if I am not mistaken the number of pulses arriving to Alice are: $(2/a\Delta t)\sqrt{L^2-1/a^2}$.

 

[Ibix]

Bob's, because $\Delta t$ is according to his clock.

So if I am not mistaken the number of pulses arriving to Alice are: $(2/a\Delta t)\sqrt{L^2-1/a^2}$.

Exactly - the same number as emitted.