Answer
Choice C.
Work Step by Step
We are told that the number of photons remaining obeys the equation $N=N_0e^{-\mu x}$ where $\mu=0.1 cm^{-1}$.
Calculate $\frac{N}{N_0}=e^{-(0.1 cm^{-1})(20cm)}=0.135$ which is closest to choice C, 14 percent.
University Physics with Modern Physics (14th Edition)
by Young, Hugh D.; Freedman, Roger A.
Published by
Pearson
ISBN 10:
0321973615
ISBN 13:
978-0-32197-361-0
Chapter 44 - Particle Physics and Cosmology - Problems - Exercises - Page 1522: 44.59
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