# GUTs: The Unification of Forces: [IMAGE] The intensity of cosmic ray radiation decreases rapidly ...

## 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 ${\mathrm{10}}^{10}$ GeV converts its energy into particles with masses averaging 200 MeV/${c}^{2}$. Given that the number of particles created were $5×{10}^{10}$. If the particles rain down on a 1.00-k${m}^{2}$ area, how many particles are there per square meter?

## AnswerChoose the correct answer.Choose all that apply. Correct Partially correct Incorrect Don't Know

1. A
Correct Answer
$11×{10}^{4}\mathrm{particles}/{m}^{3}$
2. B
Correct Answer
$9×{10}^{4}\mathrm{particles}/{m}^{3}$
3. C
Correct Answer
$5×{10}^{4}\mathrm{particles}/{m}^{2}$
4. D
Correct Answer
$7×{10}^{4}\mathrm{particles}/{m}^{3}$
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This question is available under a CC BY license. Attribution: Rice University. Textbook content produced by OpenStax College is licensed under a Creative Commons Attribution 3.0 Unported License.

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