University Physics with Modern Physics (14th Edition)

Published by Pearson
ISBN 10: 0321973615
ISBN 13: 978-0-32197-361-0

Chapter 1 - Units, Physical Quantities, and Vectors - Problems - Exercises - Page 28: 1.19


$3 \times 10^8$ blinks in a lifetime.

Work Step by Step

Assume 1 blink every 5 seconds during waking hours, and that the person is awake for 16 hours per day, or 57600 s. $\frac{1 blink}{5s}\frac{57600s}{day}\frac{365days}{year}\frac{80years}{life}=3\times10^8\frac{blinks}{lifetime}$
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