Answered: Extremely energetic cosmic ray…

Inquiry into Physics

8th Edition

ISBN:9781337515863

Author:Ostdiek

Publisher:Ostdiek

Chapter12: Relativity, Particle Physics, And Cosmology

Section: Chapter Questions

Problem 1P

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Question

The intensity of cosmic ray radiation decreases rapidly with increasing energy, but there are occasionally extremely energetic cosmic rays that create a shower of radiation from all the particles they create by striking a nucleus in the atmosphere as seen in the figure given below. Suppose a cosmic ray particle having an energy of 1010 GeV converts its energy into particles with masses averaging 200 MeV/c² .
(a) How many particles are created? (b) If the particles rain down on a 1.00-km² area, how many particles are there per square meter?

Extremely
energetic
cosmic ray
Atmosphere
Earth's surface
Figure 33.27 An extremely energetic cosmic ray creates a shower of
particles on earth. The energy of these rare cosmic rays can approach a
joule (about 1010 GeV) and, after multiple collisions, huge numbers
of particles are created from this energy. Cosmic ray showers have been
observed to extend over many square kilometers.

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