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**Characteristics of Waves**

Wavelength, Frequency, Speed, Period, and Amplitude

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**Waves Wave – a disturbance that transmits energy. All waves:**

are caused by vibrations travel outward from the source of vibration have a wavelength, frequency, speed, period, and amplitude

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**Waves Different types of waves: Mechanical wave Electromagnetic wave**

Example: Sound or seismic waves Travels through matter Caused by vibrating matter Electromagnetic wave Example: Light Can travel through vacuum Caused by vibrating charges

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**Waves Disturbance can move in two ways: Transverse wave**

Disturbance is perpendicular to direction of wave motion Longitudinal (or compressional) wave Disturbance is parallel to direction of wave motion

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**Water Waves: Both Transverse and Longitudinal**

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**Properties of Waves Wavelength ()**

Distance from one wave crest to the next. SI Unit: meters

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Wavelength

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Wavelength High density Low density

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**Properties of Waves Frequency (f )**

No. of waves that pass a fixed point per unit of time. SI Unit: s-1 or Hertz (Hz)

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**Properties of Waves Velocity (v) How fast a wave travels. v = f* **

SI Unit: m/s

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**Properties of Waves Period (T) Amplitude (A) Demo: Sound Waves Applet**

Time required for one complete wave to pass. Inverse of frequency T = 1/f SI Unit: s Amplitude (A) Maximum displacement of wave Demo: Sound Waves Applet

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Amplitude A A

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Amplitude Higher Amplitude Lower Amplitude

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Waves What is the frequency of a wave whose speed is 400 m/s and whose wavelength is 20 meters? v = f (400 m/s) = (20 m)f f = 20 Hz

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Waves What is the period of a wave whose speed is 550 m/s and whose wavelength is 50. m? v = f f = v/ T = 1/f T = /v = (50. m)/(550 m/s) = .091 s

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Waves A certain wave has a frequency of 445 Hz and a wavelength of 2.20 meters. How fast is the wave traveling? v = f v = (445 Hz)(2.20 m) v = 979 m/s

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Waves A certain wave has a period of 3.15 seconds and a wavelength of 500. meters. How fast is the wave moving? v = f f = 1/T f = 1/3.15 s = Hz v = (500. m)(0.317 Hz) v = 159 m/s

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