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Chapter 15 Vocabulary
N/A
32
Science
9th Grade
11/01/2011

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Term
Pitch
Definition
how high or low a sound is; determined by frequency
Term
Frequency
Definition
number of wavelengths that pass a point in a given time interval
Term
Amplitude
Definition
Greatest distance that particles are displaced from their normal rest
Term
Wave Speed
Definition
how fast a wave moves, or how far a wave travels in a certain amount of time
Term
Doppler Effect
Definition
observed change in frequency of a wave when the source or observer is moving
Term
Wavelength
Definition
distance between any two successive identical parts of a wave
Term
Sine Wave
Definition
wave that has the shape of a sine curve (looks like an S lying on its side)
Term
Period
Definition
time required for one full wavelength of a wave to pass a certain point
Term
Node
Definition
point on a standing wave that has no vibration caused by complete destrucive interference
Term
Standing Wave
Definition
pattern of vibration resulting from intereference between a wave and its reflected sound that simulates a wave standing still
Term
Reflection
Definition
bouncing bacl of a wave when it meets a surface or boundary
Term
Refraction
Definition
bending of waves when a wave changes speed passing from one medium to another at an angle
Term
Constructive Interference
Definition
superposition of two or more waves when they meet crest to crest and reinforce one another creating a larger amlitude
Term
Interference
Definition
combining of two ot more waves into a single wave when they are in the same location
Term
Antinode
Definition
point of maximum vibration on a stanfing wave caused by complete constructive interference
Term
Diffraction
Definition
bending of waves as they pass an edge, such as an opening, or encounter an obstacle
Term
Destructive Interference
Definition
superposition of two ro more waves when they meet crest to trough creating a smaller amplitude by partially canceling each other
Term
Medium
Definition
matter through which a wave travels
Term
Mechanical Wave
Definition
wave that requires a medium through which to travel
Term
Electromagnetic Wave
Definition
wave made of changing electric and magnetic fields in space
Term
Wave Front
Definition
circles of energy created by waves
Term
Transverse Wave
Definition
wave in which the wave motion is perpendicular to the particle motion
Term
Crest
Definition
highest point of a transverse wave
Term
Trough
Definition
lowest point of a transverse wave
Term
Wave
Definition
disturbance that carries energy through matter or space
Term
Seismic Wave
Definition
wave that travels through Earth
Term
Tsunami
Definition
huge ocean wave that is caused by an earthquake
Term
Rarefraction
Definition
area of a longitudal wave where particles are crowded together
Term
Surface Wave
Definition
wave in which particles move both perpendicularly and parallel to the direction in which the wave travels in an ellipse
Term
Longitudal Wave
Definition
wave motion is parallel to the particle motion
Term
Compression
Definition
longitudal wave where particles are crowded together
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