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Characteristics of Waves
prentice hall book O
13
Science
7th Grade
05/14/2009

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Term
wave
Definition
a disturbance that transfers energy from place to place
Term
energy
Definition
the ability to do work
Term
medium
Definition
the material with molecules through which a wave travels: air, liquids, solids
Term
How are waves created?
Definition
a source of energy causes a medium to vibrate
Term
3 types of waves - grouped by how they move
Definition
transverse , longitudinal, surface
Term
Basic properties of waves
Definition
amplitude, wavelength, frequency, and speed
Term
the formula for the relationship between speed, wavelength and frequency
Definition
Speed = Wavelength x frequency
Term
What happens when an object or wave hits a surface through which it can't pass?
Definition
it bounces back (reflection)
Term
What happens when a wave moves from one medium to another at an angle?
Definition
It changes speed and bends (refraction)
Term
Seismic wave
Definition
stress in the rock beneath Earth's surface builds up and the rock changes shape or breaks releasing energy
Term
Types of seismic waves
Definition
primary, secondary, surface
Term
seismograph
Definition
a graphing machine that records ground movement caused by seismic waves
Term
refraction
Definition
the bending of waves due to a change in speed
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