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Waves and their Properties

Waves and their Properties. Warmup includes Tacoma Narrows Bridge Video. Warmup. Turn in your homework: page 513 (1-9) Prepare for an extreme video on waves. Questions for warmup will follow. Warmup. What features could be built into a bridge to prevent this?

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Waves and their Properties

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  1. Waves and their Properties Warmup includes Tacoma Narrows Bridge Video

  2. Warmup • Turn in your homework: page 513 (1-9) • Prepare for an extreme video on waves. Questions for warmup will follow.

  3. Warmup • What features could be built into a bridge to prevent this? • Discuss the importance of this bridge disaster in the history of bridge building.

  4. What is a Wave? • Mechanical Wave – a disturbance in matter that carries energy from one place to another. • Mechanical waves require a medium (matter through which they travel). • Most waves are caused by vibrating objects.

  5. What is a Wave? • Three types of mechanical waves (see your foldable): • Transverse • Longitudinal • Surface

  6. Properties of Waves • Most common properties used to describe waves: • Amplitude • Wavelength • Period • Frequency • Wave Speed

  7. Amplitude • Amplitude is the maximum distance the medium move away from its rest position. • The amplitude of a transverse wave is the maximum distance from the rest position to a crest or trough.

  8. Amplitude • Amplitude is the maximum distance the medium move away from its rest position. • The amplitude of a longitudinal wave is a measure of how compressed or rarefied the medium becomes.

  9. Wavelength • The distance between one point on one wave and the same point on the next cycle is its wavelength. • Represented with a λ(lambda)in equations.

  10. Wavelength • Both amplitude and wavelength are measurements of distance. • Transverse measure from crest to crest or trough to trough. • Longitudinal measure from one compression to the next.

  11. Period • The time it takes a complete wave cycle to occur. • AKA the time needed for one full wavelength of a wave to pass a certain point. • Expressed in seconds (time measurement).

  12. Frequency • Frequency –The number of complete waves that pass a given point in a given time. • AKA number of vibrations/cycles per second. • Frequency is measured in hertz (Hz), = 1 cycle per second.

  13. Wave Speed • You can calculate the speed (v) of a wave by multiplying the wavelength (λ) and the frequency (f): v = f x λ • The units for wave speed are m/s.

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