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Waves

EH

Enith Hernandez

Transcript

Waves

Terms

Compression

Rarefaction

Trough

Crest

Medium

Waves

Wavelength

Frequency

Amplitude

Review

Waves in Everyday Life

1. Play the movie

2. Play the quiz

Speed or Velocity of a Wave

waves in water

sound waves

http://tinyurl.com/waves-brainpop

Another important property of a wave is the speed (or velocity) of propagation. This is how fast the disturbance or vibration of the wave is moving. ie. sound will travel at a different speed in water than in air.

microwaves

frequency is the number of waves that pass a point in 1 second, measured in hertz (Hz) - waves per second.

What is a wave?

  • A wave is a traveling disturbance that travels through space and matter transferring energy from one place to another.
  • Waves transfer energy, not matter. After the wave passes, the matter (usually) returns to its original position.
  • The matter a wave passes through is called a "medium."

The Anatomy of a Longitudinal (Compressional) Wave

wavelength: distance between two consecutive compressions or rarefactions

The Anatomy of the Transverse Wave

Light Wave Behavior

When waves encounter new mediums, barriers, or other waves they can behave in different ways:

Properties of Waves

Amplitude (y)

Wavelength ( )

  • The distance a wave travels from its starting point, or equilibrium position.
  • The distance between two similar, consecutive points of a wave. (either crest or trough).

  • Both longitudinal (compressional) and transverse have wavelength.

How do waves transfer energy?

1. Transverse

  • particles move up and down, perpendicular to the direction the wave moves.

2. Longitudinal (or compressional)

  • disturbance or vibrations move parallel to the direction the wave moves.
  • only travel through solids, liquids, and gas.
  • can't travel in a vacuum (space) which has no matter to transmit energy.
  • when the particles of the wave move together it is called compression, when they pull apart is called rarefaction.

Sound Wave Behavior

SC.7.P.10.3 The students will recognize that light waves, sound waves, and other waves move at different speeds in different materials.

SC.7.N.1.1 The students will define a problem from the seventh grade curriculum, use appropriate reference materials to support scientific investigation of various types, such as systematic observations or experiments, identify variables, collect and organize data, interpret data in charts, tables, and graphics, analyze information, make predictions, and defend conclusions.

Slinky Activity!