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# SOUND WAVES AND PROPERTIES

## by Sciencetutors E-learning Media on Jul 04, 2008

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To know that sound can be reflected, refracted, diffracted, and produces interference effects. ...

To know that sound can be reflected, refracted, diffracted, and produces interference effects.

Know that sound is a wave because it can be reflected and refracted as with particles, diffraction and interference only occur with waves

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## SOUND WAVES AND PROPERTIESPresentation Transcript

• OBJECTIVES OF LESSON To know that sound can be reflected, refracted, diffracted, and produces interference effects. Know that sound is a wave because it can be reflected and refracted as with particles, diffraction and interference only occur with waves SOUND WAVES
• Make a list of keywords used in the learning Objectives (2 minutes task)
• Sound
• Reflected
• Refracted
• Diffracted
• Interference effects
• Waves
• The keywords listed above are crudely known by most students as
• Bouncing
• Bending and
• Reflection could be defined as the bouncing of waves when they hit a surface.
• Refraction is mostly defined by many as the change in the direction or speed or the bending of waves.
• When waves meet a gap in a barrier as they travel from the source, they carry on through the gap and spread out . The spreading out of waves when the go through a gap or an opening in a barrier. This diffraction
• In the d iffraction diagram above- the straight parallel waves could be seen to be spreading-out when they go through a gap.
• What is Wave Interference? Consider two pulses of the same amplitude travelling in different directions along the same medium as shown. Note: During interference snapshots of the medium for two such pulses both waves have an upward displacement. Therefore, there is an upward displacement in the medium which tends to be greater than the displacement of the two interfering pulses as shown in the second diagram. Your task: Draw 2 waves pulses showing destructive interference. Constructive Interference
• The speed of waves usually changes when they cross a boundary that is the boundary between glass-air, air-glass or water-glass or shallow-deep
• Questions you may have include: Can the width of the gap affect diffraction of waves? The extent of the spreading depends on how the width of the gap compares to the wavelength of the waves . The bigger the gap width compared with the wavelength of the wave, the less the diffraction . Compare the width of the gaps shown in diagrams A and B. Look at the waves as they go through them.