
Elements Of Electromagnetics
7th Edition
ISBN: 9780190698614
Author: Sadiku, Matthew N. O.
Publisher: Oxford University Press
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Transcribed Image Text:Problems
Chapter 17 of "Physics for Scientists and Engineers", 10th ed. by Serway and Jewet.
Two sound waves arrive at your ear simultaneously; they have slightly different frequencies: wi and
w2 and equal amplitudes. You hear the loudness oscillate sinusoidally; this is what we refer to as
"beats". Show that the total sound wave has the the form:
P(t) = Patm + 28P cos((w1 - w2)/2) cos((w1 + w2)/2).
(1)
e,
bimagination
Cosl lWi-We) +
Cos/ (W,+We)+
Real puth Releiter Reterort
ot above
expussion
Real purts
Coslwit) + Cos (We t)
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