A pion travels at a speed of 0.98c 0.98c\,0.98c relative to an observer.
The pion travels a distance of 4.2 × 103 m between two points in the frame of reference of the observer.
Calculate the distance between these two points in the frame of reference of the pion.
Measurements of pions created by cosmic rays can be used to demonstrate relativistic time dilation.
State the measurements made and the observation that provides evidence for relativistic time dilation.
As the pions travel through the atmosphere, their speeds are reduced by interaction with the particles in the air.
Discuss, with reference to relativity, the effect that this reduction of speed has on the rate of detection of the pions on the surface of the Earth.
