Waves and Energy Transfer Wave Properties

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Waves and Energy TransferWave Properties
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Wave Properties

• Both particles and waves carry energy
• Particles transfer matter
• Waves the particles arent transferred

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Types of Waves
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Mechanical Wave

• Waves that require a medium
• Sound, water, in air, on a Slinky
• These waves are governed by Newtons laws

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Electromagnetic wave

• waves in which no medium is needed
• light, radio, x-ray
• travel at the speed of light (3 x 108 m/s)
• hard to examine so compare to water waves

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• transverse wave
• a wave in which the particles of the medium move
  perpendicular to the direction of the energy
• longitudinal wave
• a wave in which the particles of the medium move
  parallel to the direction of the energy

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• surface wave
• a wave where the particles of the medium move
  both parallel and perpendicular to the direction
  of the energy

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How are waves Produced?

• Wave pulse
• a single jerk or pluck
• rock dropped into water
• quick plink on a piano key

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• Traveling wave
• a continuous regular source of energy
• ringing bells, kicking in the water

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The Measures of a Wave

• Period (T) measured in seconds(s)
• the time for one cycle

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• frequency (f) measured in Hertz (Hz)
• the number of cycles per second
• or (reciprocals)
• crest-highest point of a wave
• trough-lowest point of a wave

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• Wavelength (l) measured in m, cm, mm, nm
• The distance from crest to crest or trough to
  trough

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How Fast Does a Wave Move?

• Velocity (v) measured in m/s
• The speed of the wave
• v lf
• v d/t

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Amplitude of a Wave

• The maximum displacement from rest position
• more amplitude will take more energy