Consmic ray muons, which decay spontaneously with proper lifetime 2.2 µs, are produced in the atmo sphere, at a height of 5 km above sea level. These move straight downwards at 98%of the speed of light. Find the percent ratio 100 × (N/N) of the number of muons measured at the top of two mountains A and B, which are at heights 4,848 m and 2,682 m respectively above mean sea level. A

Consmic ray muons, which decay spontaneously with proper lifetime 2.2 µs, are produced in the atmo sphere, at a height of 5 km above sea level. These move straight downwards at 98%of the speed of light. Find the percent ratio 100 × (N/N) of the number of muons measured at the top of two mountains A and B, which are at heights 4,848 m and 2,682 m respectively above mean sea level. A