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# Reflection and Transmission of Mechanical Waves

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Reflection and Transmission of Mechanical Waves

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### Reflection and Transmission of Mechanical Waves

1. 1. Reflection andTransmission ofMechanical Waves • Millathina Puji Utami (100210102029) • Pindah Susanti (100210102056)
2. 2. • Reflection is the change in direction of a wavefront at an interface between two different media so that the wavefront returns into the medium from which it originated. Common examples include the reflection of light, sound and water waves.• When a wave comes across a change in the medium, an interface surface, a portion of the wave’s energy is reflected back, and another portion is transmitted through the boundary.• Reflected and transmitted waves are generated by the incident wave. Waves and Optics
3. 3. xWaves and Optics
4. 4. Equation for everymedium Waves and Optics
5. 5. transmissionreflection Waves and Optics
6. 6. 1− Reflected and Transmitted power21+2 Became Waves and Optics
7. 7. Simple example of a wave in a tube that narrows The reflection coefficient is positive so that the leading forward compression wavefront reflects as a backward compression wave and the trailing expansion wave reflects as an expansion wave. The transmitted wave must match the pressure produced by the incident and reflected waves at the discontinuity in area giving a wave of similar form but with an increased amplitude.Waves and Optics
8. 8. Simple example of a wave in a tube that widens The reflection coefficient is negative so that the leading forward compression wavefront reflects as a backward expansion wave and the trailing expansion wave reflects as a compression wave. The transmitted wave is similar in form to the incident wave with a reduced amplitude because of the negative reflection. Note the direction of circulation in the different waves.Waves and Optics
9. 9. Reflection of Transverse Wave Pulse • A pulse traveling to the right on a heavy string attached to a lighter string • Speed suddenly increases
10. 10. For a narrowing vessel with areflection coefficient R=+0.5, the reflected wave is a compression wave that produces flow in the backward direction. Waves and Optics
11. 11. Reflection of Transverse Wave Pulse • A pulse traveling to the right on a light string attached to a heavier string • Speed suddenly decreases
12. 12. For an expanding vessel with areflection coefficient R=-0.5, the reflected wave is an expansion wave that produces flow in the forward direction. Waves and Optics
13. 13. Thank You