1. happyphysics.com Physics Lecture Resources Prof. Mineesh Gulati Head-Physics Wing Happy Model Hr. Sec. School, Udhampur, J&K Website: happyphysics.com

2. Ch 15 Mechanical Waves © 2005 Pearson Education

3. 15.1 Types of Mechanical Waves © 2005 Pearson Education

4. Mechanical wave is a disturbance that travels through some material or substance called the medium for wave. Mechanical wave is a disturbance that travels through some material or substance called the medium for wave. Transverse wave is the wave that the displacement of the medium are perpendicular or transverse to the direction of travel of the wave along the medium Transverse wave is the wave that the displacement of the medium are perpendicular or transverse to the direction of travel of the wave along the medium Longitudinal wave is the wave that the motions of particles is the same as the direction of wave. Longitudinal wave is the wave that the motions of particles is the same as the direction of wave. © 2005 Pearson Education

5. 15.2 Periodic Waves © 2005 Pearson Education

6. periodic wave © 2005 Pearson Education

8. Example 15.1 Sound waves are longitudinal waves in air. The speed of sound depends on temperature at 20 ℃ it is 344m/s. What is wavelength of a sound wave in air at 20 ℃ if the frequency is 262 Hz? Sound waves are longitudinal waves in air. The speed of sound depends on temperature at 20 ℃ it is 344m/s. What is wavelength of a sound wave in air at 20 ℃ if the frequency is 262 Hz? ANS: ANS: © 2005 Pearson Education

9. 15.3 Mathematical Description of a Wave sinusoidal wave moving in +x-direction © 2005 Pearson Education Phase

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11. wave equation © 2005 Pearson Education

13. 15.4 Speed of a Transverse Wave speed of a transverse wave on a string © 2005 Pearson Education Mass per unit length

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15. 15.5 Energy in Wave Motion © 2005 Pearson Education

16. Max Power average power, sinusoidal wave on a string © 2005 Pearson Education

18. inverse-square law for intensity © 2005 Pearson Education Average intensity

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20. 15.6 Wave Interference, Boundary Conditions, and Superposition © 2005 Pearson Education

21. Overlap of two wave pulses

22. principle of linear superposition © 2005 Pearson Education

24. standing wave on a string, fixed end at x = 0 © 2005 Pearson Education

25. 15.7 Standing Waves of a String © 2005 Pearson Education

26. 15.8 Normal Modes of a String © 2005 Pearson Education

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