# Lec16 - General Physics WAVES AND SOUND 1 Wave Motion A...

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General Physics Dr. Brahmia 1 1 Wave Motion A wave is, in general, a disturbance which moves through a medium. It carries energy from one location to another without transporting the material of the medium. Example: Water waves, waves in a string, and sound waves. WAVES AND SOUND 2 Transverse Waves In a transverse wave, the particles of the medium move at right angles to the direction of wave. The top part of the wave is called the crest while the portion of the wave below the equilibrium position is called the trough . WAVES AND SOUND…

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General Physics Dr. Brahmia 2 3 Longitudinal Waves In a longitudinal wave, the particles of the medium move back and forth, parallel to the direction of motion of the wave. The result is a series of expansions alternating with compressions which travel along the length of the medium. The region where the particles of the medium are close together is called a compression while the region where the particles are farther apart is called an expansion . WAVES AND SOUND… 4 Periodic Waves The velocity (v) of a wave through a medium remains fixed as long as the medium does not change. For a given periodic wave, the velocity is given by where (f) is the frequency and ( ) is the wavelength, which is the horizontal length of one cycle or the distance between adjacent crests. f v WAVES AND SOUND…
General Physics Dr. Brahmia 3 5 The Mathematical Description of a Wave When a wave travels through a medium, particles are displaced from their undisturbed positions. The mathematical expressions for a periodic wave that is traveling along the x-axis with an amplitude (A) , frequency (f), and a wavelength ( ) are given as follow:

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