**TIME DILATION IS A REAL EFFECT - TIME DILATION IN RELATIVITY - WHAT IS TIME DILATION?**

Hence in its life time
a Mu meson can travel a distance

But the question is
that Mu meson travel a distance of 10 km to reach the earth surface. This is
possible by time dilation.

In its own frame, Mu mesons
have an average life time is
Now

This example explains the presence of Mu mesons
on the earth. Hence we can say that time dilation is real effect.

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