Properties of Waves 8.1. Mechanical Waves Require a medium to transfer energy from one place to...

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Properties of Waves 8.1

Transcript of Properties of Waves 8.1. Mechanical Waves Require a medium to transfer energy from one place to...

Page 1: Properties of Waves 8.1. Mechanical Waves Require a medium to transfer energy from one place to another.

Properties of Waves

8.1

Page 2: Properties of Waves 8.1. Mechanical Waves Require a medium to transfer energy from one place to another.

Mechanical Waves

• Require a medium to transfer energy from one place to another.

Page 3: Properties of Waves 8.1. Mechanical Waves Require a medium to transfer energy from one place to another.

Transverse and Longitudinal Waves• Wave pulse—single disturbance that travels

through the medium• Periodic wave—if the source vibrates

repeatedly• Transverse wave—the particles in the

medium move in a direction perpendicular to the direction of wave motion

• Longitudinal wave—the particles in the medium move in the same direction (or parallel to) the wave

Page 4: Properties of Waves 8.1. Mechanical Waves Require a medium to transfer energy from one place to another.

Amplitude

• The distance from the equilibrium position to the crest of a wave

amplitude

Page 5: Properties of Waves 8.1. Mechanical Waves Require a medium to transfer energy from one place to another.

Wavelength

• λ—the shortest distance between two points of a wave where the pattern repeats

λ

λ

Page 6: Properties of Waves 8.1. Mechanical Waves Require a medium to transfer energy from one place to another.

Frequency and Period

• Frequency (f)—the number of waves (cycles) per unit time that pass a point in the medium—Hz (hertz)

• Period (T)—the amount of time it takes for one complete wavelength to pass a point in the medium

• f 1T

T 1f

Page 7: Properties of Waves 8.1. Mechanical Waves Require a medium to transfer energy from one place to another.

Speed

• • Velocity = distance traveled (wavelength) divided

by time interval • • Velocity = wavelength X frequency

v T

v f

Page 8: Properties of Waves 8.1. Mechanical Waves Require a medium to transfer energy from one place to another.

Sound• Longitudinal mechanical wave that causes

pressure variations in a medium• Compression—a region of increased air

density and pressure• Rarefaction—a region of decreased air

density and pressure• When you hear sound, energy is transferred

from a source to your ears, which causes your eardrum to vibrate.


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