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Chapter 10 and 11 Vocab
For test on 2-28
22
Science
7th Grade
02/27/2014

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Term
Medium
Definition
matter the waves travels through
Term
Tranverse Waves
Definition
Matter in the medium moves back and forth at right angles to the direction the wave travels
Term
Compressional Waves
Definition
Matter in the medium moves back and forth along the same direction the wave travels
Term
Rarefraction
Definition
less dense regions of a compressional wave
Term
wavelength
Definition
Distance between one point on a wave and the nearest point just like it
Term
Frequency
Definition
the number of wavelength that pass a fixed point each second
Term
period
Definition
the amount of time it takes one wavelength to pass a point
Term
amplitude
Definition
related to the energy transfered by a wave
Term
refraction
Definition
bending of a wave caused by a change in its speed as it moves from one medium to another
Term
diffraction
Definition
occurs when an object causes a wave to change direction and bend around it
Term
interference
Definition
when two or more waves overlap and combine to form a new wave
Term
standing wave
Definition
type of wave pattern that forms when waves equal in wavelength and amplitude but are traveling in opposite directions continously interfer with eachother
Term
intensity
Definition
amount of energy transfered by a sound wave through a certain area each second
Term
pitch
Definition
human perception of frequency of sound waves
Term
Doppler effect
Definition
change  in pitch of frequency due to the relative motion of a wave source
Term
index of refraction
Definition
the ratio of the speed of light in a vaccum to the speed of light in the material
Term
convex lens
Definition
thicker in the middle thinner at the edges
Term
concave lens
Definition
thinner in the middle and thicker at the edges
Term
pigment
Definition
colored material that is used to change the color of other substances
Term
concave mirror
Definition
surface of the mirror is curved inward
Term
convex mirror
Definition
curves   outwards
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