Muons are subatomic particles that are produced several milesabove the earth's surface as a result of collisions of cosmic rayswith atoms in the atmosphere. These muons rain down more orless uniformly on the ground, although some decay on the waysince the muon is unstable with a proper half life of 1.5 μ s(1 μ s =10-6s). In a certain experiment amuon detector is carried in a balloon to an altitude of 2000 m, andin the course of 1 hour it registers 650 muons traveling at 0.99ctoward the earth. If an identical detector remains at sealevel, how many muons would you expect it to register in 1hour?