Ch. 12 Waves pgs. 436 - 468.

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Presentation transcript:

Ch. 12 Waves pgs. 436 - 468

Properties of Waves A wave is the motion of a disturbance A mechanical wave needs a medium through which the wave can travel Medium = solid, liquid, or gas Waves travel fastest through solids, then liquids, slowest through gases

Two types of mechanical waves 1. Transverse waves (also called sine waves) – vibrations of the wave are perpendicular to the wave motion 2. Longitudinal waves (also called density or pressure waves) – vibrations of the wave are parallel to the wave motion.

Parts of a Wave Crest – highest part of a wave Trough – lowest part of a wave Wavelength – the distance from crest to crest or trough to trough Amplitude – maximum displacement from equilibrium

Parts of a Transverse Wave

Parts of a Longitudinal Wave Compressions – regions in which the spring is compressed Rarefactions – regions in which the spring is stretched Wavelengths are measured from compression to compression or rarefaction to rarefaction

Wavespeed equals frequency times wavelength Wavelength (λ) has units of meters.

A piano string vibrates with a frequency of 264 Hz A piano string vibrates with a frequency of 264 Hz. Assuming the speed of sound in air is 343 m/s, what is the wavelength?