An Introduction to Modern Astrophysics · Problem 4.4

The Interaction of Light and Matter — Carroll & Ostlie

Physics — Astrophysics · length-contraction

Problem

A rod moving relative to an observer is measured to have its length

L_{\rm moving}

contracted to one-half of its length when measured at rest. Find the value of

u/c

for the rod's rest frame relative to the observer's frame of reference.