Some radioactive nuclei are observed by 4 different observers
PHYSICS · Single correct · A Level · Physics · Turning points in physics · Turning points in physics
Problem
Some radioactive nuclei are observed by 4 different observers, each travelling at a different speed with respect to the nuclei.
The observer who measures the half-life of the nuclei to be the shortest has a speed, relative to the nuclei, of
(1) zero.
(2) 0.33c .
(3) 0.66c .
(4) 0.99c .