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# Unit 7: Waves, Sound, and Light..

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Unit 7: Waves, Sound, and Light..

SPS9: Properties of Waves
Amplitude: the height of the wave, measured in meters. Wavelength: the distance between adjacent crests, measured in meters. Period: the time it takes for one complete wave to pass a given point, measured in seconds. Frequency: the number of complete waves that pass a point in one second, measured in inverse seconds, or Hertz (Hz). Speed: the horizontal speed of a point on a wave as it propagates, measured in meters / second.

SPS9a: Recognize that all waves transfer energy.
Waves are a way in which energy is transferred from place to place without the transfer of matter.  The energy is carried from place to place in the form of a disturbance or movement. Waves, which move through matter, are called mechanical waves.  They require an elastic material medium through which to pass.  Examples of matter waves are water waves at the beach and sound waves moving through the air.  Waves, which do not require a material medium, are called electromagnetic waves.  Examples of electromagnetic waves are light and radio waves. Medium- the matter the waves travel through.

Types of Mechanical Waves
Transverse waves are waves in which the movement of the vibrating particles is perpendicular to the direction of the wave. Longitudinal waves are waves in which the movement of the vibrating particles is parallel to the direction of the wave.

Wavelength is related to Frequency
As frequency increases, the wavelength decreases. Sound waves usually travel faster in liquids and solids than they do in gases. Light waves travel more slowly in liquids and solids than they do in gases or in empty space. Light waves travel faster than sound waves. Example on pg. 298

SPS9c: Compare and contrast the characteristics of electromagnetic and mechanical (Sound) waves.
(Light) Similarities Mechanical (Sound)

SPS9b: Relate frequency and wavelength to the energy of different types of electromagnetic waves and mechanical waves. Similarities Electromagnetic Mechanical

When two or more waves overlap and combine to form a new wave.
SPS9d: Investigate phenomena of refraction, reflection, diffraction, and interference. Refraction Reflection Diffraction Interference The bending of a wave as it changes speed in moving from one medium to another. The angle at which a light wave strikes a surface is the same as the angle which it is reflected. The bending of waves around an obstacle; also occur when waves pass through a narrow opening. When two or more waves overlap and combine to form a new wave.

Reflection Refraction

Diffraction Interference

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