Two sound waves are emitted: y1, with frequency f1, and y2, with frequency f2, with other constants identical, as expressed below. Distances in meters, times in seconds, and angles in radians:
(1) y1 = .02 sin(8 Pi x - 108 Pi t) (2) y2= .02 sin (8 Pi x - 100 Pi t)
The two waves add to produce the sound perceived by a listener.
PART a. Show y, the equation of the sum, y1 + y2, of the two waves.
PART b. Find the beat frequency of the combined waves.© BrainMass Inc. brainmass.com September 20, 2018, 4:14 pm ad1c9bdddf - https://brainmass.com/physics/sound-propagation/two-sound-waves-emitted-show-equation-sum-7546
When two slightly different frequencies are propagated simultaneously, interference occurs between them and they combine together to produce a "beat note" whose frequency is fb = .5 (f2 - f1). Guitars are often tuned by using this phenomenon. If one string sounds a certain frequency, then another string's tension is adjusted until their beat note frequency becomes zero; then the two strings ...
The two sound waves which are emitted are determined. Sound waves perceived by a listener are determined. In a step by step solution, the answers are derived using the formulas presented.