Essential University Physics: Volume 1 (3rd Edition)

Published by Pearson
ISBN 10: 0321993721
ISBN 13: 978-0-32199-372-4

Chapter 14 - For Thought and Discussion: 8

Answer

Please see the work below.

Work Step by Step

We know that the human ear's hearing range is 20 Hz -20 KHz. Ultra sound frequencies are $10^7$ Hz . The difference between these two frequencies is $10^7Hz-20KHz=0.998\times 10^3Hz$. Thus, these ultra sound frequencies are very high as compared to the human ear range. Ultra sound is a sound having all the physical properties of sound but the only difference is that the human ear cannot hear it.
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