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Ch 11 and 12 by Mind Map: Ch 11 and 12
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Ch 11 and 12

This is just a demo map that you can delete right away, if you feel like it...

Waves

Different than Point-like Particles

Oscillate and transmit energy

Intensity of transmission

Signal transmission

Standing or Moving Waves

Properties of Waves

Velocity, speed and vector

Frequency, cycles per time

Period

Wavelength, distance between the centers of consecutive compressions

Types of Waves

Longitudinal, the motion of particles in the medium is along the same line as the direction of propagation of the wave

Transverse, the motion of particles in the medium is perpendicular to the direction of propagation of the wave

Combinations

Seismic Waves (S-Waves and P-Waves), Triangulation of S- and P-Waves to find the focus of an Earthquake

Harmonic waves repeat sinusoidally

Traveling wave, Wave that moves in space and time

Periodic, repeats the same pattern over and over

Mathematical Descriptions of Waves

Graphing Traveling Waves

One of the two independent variables must be held constant If x is constant, one particular point is described as a function of time. Frequency If t is constant, the basic shape of the wave is shown for each instant of time Wave Length

Superposition of Waves

Constructive

Destructive

Reflection, Bouncing of waves

Refraction, Bending of waves

Diffraction, Spreading out of waves

Sound

Longitudinal Pressure Waves

Pressure as a function of time and space

Described by both pressure and displacement

Audible Range 20hz-20kHz

Infrasound, <20hz

Ultrasound, >20kHz

Amplitude and Intensity of Sound Waves

Decibel Scale, dB

Resinence increases energy

Standing wave

reflecting wave, makes look like stand still

Standing Waves on a String, Antinodes, 1/2 wave lenth in the middle, Nodes, never move

Longitudinal Pressure Waves

Pressure as a function of time and space

Described by both pressure and displacement

Timbre

Fundamental, lowest frequency in a complex sound wave

The rest of the frequencies are called overtones

Pitch

the perception of frequency