Presentation on theme: "Chapter 14 Waves and sound Dr. Haykel Abdelhamid Elabidi November/December 2013/Muh 1435."— Presentation transcript:
Chapter 14 Waves and sound Dr. Haykel Abdelhamid Elabidi November/December 2013/Muh 1435
Units of Chapter 14 Types of waves Harmonic wave functions Waves on a string Sound waves Sound intensity Superposition and interference Standing waves
Types of waves A wave is a disturbance that propagates from one place to another. 1.Transvers wave: the displacement of the medium is perpendicular to the direction of motion of the wave. The wave on a string have the shape of sine or cosine; such a waves are called harmonic wave. 2.Longitudinal wave: the displacement of individual particles is parallel to the direction of propagation of the wave. The individual particle in the air oscillate back and forth about a given position. 3.Water waves: are a combination of transverse and longitudinal waves
Types of waves The period T is the time for one wavelength to pass a given point. The wavelength λ is the distance over which the wave repeats.
Types of waves Exercise 2: A tennis ball is hit back and forth between two players warming up for a match, If it takes 2.31 s for the ball to go from one player to the other. What are the period and the frequency of the ball’s motion? Solution:
When a wave reaches the end of a string, it will be reflecte. If the end is fixed, the reflected wave will be inverted. If the end of the string is free to move transversely, the wave will be reflected without inversion
Sound waves The human ear can hear sounds between about 20 Hz and 20 KHz f<20 Hz: Infrasonic f>20 KHz:Ultrasonic
Standing waves A standing wave is the wave that is fixed in its location but oscillates with time. These waves are found on strings with both ends fixed, such as in a musical instrument or in vibrating columns of air (like a soda bottles)
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