WavesSection 1 What Is a Wave? 〉 What does a wave carry? 〉 A wave is a disturbance that carries energy through matter or space.

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WavesSection 1 What Is a Wave? What does a wave carry?
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Presentation transcript:

WavesSection 1 What Is a Wave? 〉 What does a wave carry? 〉 A wave is a disturbance that carries energy through matter or space.

WavesSection 1 What Is a Wave?, continued

WavesSection 1 What Is a Wave?, continued Most waves travel through a medium. –medium: a physical environment in which phenomena occur –mechanical wave: a wave that requires a medium through which to travel –examples: sound waves, water waves

WavesSection 1 What Is a Wave?, continued Electromagnetic waves do not require a medium. –electromagnetic wave: a wave that consists of oscillating electric and magnetic fields, which radiate outward at the speed of light –examples: visible light waves, radio waves

WavesSection 1 What Is a Wave?, continued Waves transfer energy. –Tsunamis carry enough energy to cause damage to coastal towns. –The energy of normal ocean waves breaks up rocks into pieces to form sandy beaches.

WavesSection 1 What Is a Wave?, continued Energy may spread out as a wave travels. –When sound waves travel in air, the waves spread out in spheres. –As the waves travel outward, the spherical wave fronts get bigger, so the energy spreads out over a larger volume.

WavesSection 1 Vibrations and Waves 〉 How are waves generated? 〉 Most waves are caused by vibrating objects. –The sound waves produced by a singer are caused by vibrating vocal cords. –Electromagnetic waves may be caused by vibrating charged particles. –For mechanical waves, the particles in the medium through which the wave passes vibrate, too.

WavesSection 1 Transverse and Longitudinal Waves 〉 What is the difference between a transverse wave a longitudinal wave? Transverse waves have perpendicular motion. –transverse wave: a wave in which the particles of the medium move perpendicularly to the direction the wave is traveling

WavesSection 1 Transverse and Longitudinal Waves, continued Longitudinal waves have parallel motion. –longitudinal wave: a wave in which the particles of the medium vibrate parallel to the direction of wave motion

WavesSection 1 Transverse and Longitudinal Waves, continued Waves have crests and troughs or compressions and rarefactions. –crest: the highest point of a wave –trough: the lowest point of a wave –compressions: the crowded areas of a longitudinal wave –rarefactions: the stretched-out areas of a longitudinal wave

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