1 cosmic ray muons have been used in an attempt to discover, Ask an Expert

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1. Cosmic ray muons have been used in an attempt to discover hidden burial chambers in Egyptian pyramids, in much the same way that x rays are used to discover internal imperfections in a metal casting caused by gas bubbles. Why were muons used?

2. Are there any particles other than neutrinos and antineutrinos which have definite heli-cities? Explain.

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