# Shared Flashcard Set

## Details

Mechanical Waves and Sounds
Chapter 17 of Prentice Hall's Physical Science Concepts in Action
41
Physics
04/16/2015

Term
 Mechanical Wave
Definition
 disturbance in matter that carries energy from one place to another
Term
 Medium
Definition
 meterial through which a wave travels
Term
 Crest
Definition
 highest point of the wave above the rest position
Term
 trough
Definition
 lowest point below the rest position
Term
 Transverse Wave
Definition
 wave that causes the medium to vibrate at right angles to the direction in which the wave travels
Term
 compression
Definition
 area where the particles in a medium are spaced close together
Term
 rarefaction
Definition
 area where the particles in a medium are spread out
Term
 longitudinal wave
Definition
 wave in which the vibration of the medium is parallel to the direction the wave travels
Term
 surface wave
Definition
 wave that travels along a surface separating two media
Term
 periodic motion
Definition
 any motion that repeats at regular time intervals
Term
 period
Definition
 time required for one complete cycle
Term
 frequency
Definition
 number of complete cycles in a given time
Term
 hertz
Definition
 frequency is measured in this
Term
 wavelength
Definition
 distance between a point on one wave and the same point on the next cycle of the wave
Term
 amplitude
Definition
 maximum displacement of the medium from its rest position
Term
 reflection
Definition
 occurs when a wave bounces off a surface that it cannot pass through
Term
 refraction
Definition
 bending of a wave as it enters a new medium at an angle
Term
 diffraction
Definition
 bending of a wave as it moves around an obstacle or passes through a narrow opening
Term
 interference
Definition
 occurs when two or more waves overlap and combine together
Term
 Constructive Interference
Definition
 occurs when two or more waves combine to produce a wave with a larger displacement
Term
 Destructive Interference
Definition
 occurs when two or more wave combine to produce a wave with a smaller displacement
Term
 Standing Wave
Definition
 wave that appears to stay in one place
Term
 Node
Definition
 point on a standing wave that has no displacement from the rest position
Term
 Antinode
Definition
 point where a crest or through occurs midway between two nodes
Term
 sound waves
Definition
 longitudinal waves - compressions and rarefactions that travel through a medium
Term
 intensity
Definition
 rate at whicha wave's energy flows througha given area
Term
 decibel
Definition
 unit that compares the intensity of different sounds
Term
 loudness
Definition
 physical response to the intensity of sound, modified by physical factors
Term
 pitch
Definition
 frequency of a sound as you perceive it
Term
 sonar
Definition
 technique for determining the distance to an object under water
Term
 Doppler Effect
Definition
 a change in frequency caused by motion of the sound source, motion of the listener, or both.
Term
 Resonance
Definition
 is the response of a standing wave to another wave with the same frequency
Term
 A wave is created when...
Definition
 a source of energy causes a vibration to move through a medium
Term
 Three types of waves
Definition
 Longitudinal, transverse, and surfave waves
Term
 A wave's frequency equals what?
Definition
 the frequency of the vibrating source producing the wave
Term
 A energy of a wave increases...
Definition
 amplitude increases
Term
 Reflection does not change what? but can what?
Definition
 does not change the speed or frequency of a wave, but the wave can be flipped upside down
Term
 Why does Refraction occur?
Definition
 it occurs because one side of a wave moves more slowly than the other side
Term
 2 types of interference
Definition
 constructive and destructive
Term
 A standing wave forms only if...
Definition
 the length of a vibrating cord is a multiple of one half wavelength
Term
 When does a wave diffract more?
Definition
 if its wavelength is large compared to the size of an opening or obstacle
Supporting users have an ad free experience!