In frame event (early) occurs before event (late)

PHYSICS · Multi-part · A Level · Physics · Turning points in physics · Turning points in physics

Problem

In frame SS event EE (early) occurs before event LL (late). The events are separated by a time interval Δt=tL−tE\Delta t = t_L - t_E and a space interval Δx=xL−xE\Delta x = x_L - x_E . (1) a** If EE is the event that *causes* event LL to happen, explain why ΔxΔt≤c\frac{\Delta x}{\Delta t} \le c . (2) b** Is there a frame in which LL occurs before EE ?

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