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TLHS Phy Sci #8
All About Waves
Term | Definition |
---|---|
wave | repeating disturbance that transfers energy through matter or space |
medium | matter through which a wave travels |
mechanical wave | waves that can only travel through matter |
transverse wave | particles in the medium move at right angles (perpendicular) to the direction the wave travels |
longitudinal wave | particles in the medium move the same direction (paralel) to the direction the wave travels |
crest | high point of a transverse wave |
trough | low point of a transverse wave |
compression | dense region on a longitudinal wave |
rarefaction | less dense region on a longitudinal wave |
wavelength | distance between one point on a wave and the nearest point just like it |
frequency | number of waves that pass a fixed point each second |
period | amount of time it takes one wavelength to pass a point |
amplitude | measure of the size of the disturbance of the wave |
reflection | wave strikes and object and bounces off it |
refraction | bending of a wave caused by a change in speed when moving from one medium to another |
diffraction | bending of a wave around an object |
interference | process of two or more waves overlapping and combining to form a new wave |
constructive interference | two waves combine to form a new wave larger than the originals |
destructive interference | two waves combine to form a new wave smaller than the originals |
standing wave | waves of equal length and amplitude travel in opposite directions and interfere with each other |
nodes | locations where interfering waves always cancel |
resonance | object is made to vibrate by absorbing energy at its natural frequencies |
sound | longitudinal waves that need to travel through a medium |
intensity | amount of energy that passes through a certain area in a specific amount of time |
loudness | perception of sound volume depends on sound intensity |
decibel | unit of sound |
dB | decibel |
pitch | how high or low a sound seems to be, primarily related to the frequency of the wave |
Doppler effect | change in wave frequency due to a wave source moving past an observer |
electromagnetic waves | wave made of vibrating electric charges that do not need a medium |
photon | mass-less bundle of energy that behaves like a particle |
electromagnetic spectrum | arrangement of electromagnetic waves based on the frequency of the wave |
radio waves | long electromagnetic wave with low frequency, longest wave |
microwaves | electromagnetic waves with wavelengths between 0.1 mm and 30 cm, 2nd longest wave |
infrared waves | electromagnetic wave that transfers thermal energy, 3rd longest wave |
visible light | range of electromagnetic waves that can be detected by the human eye, mid-length wave |
ultraviolet wave | electromagnetic wave that can enter cells, 3rd shortest wave |
x - rays | electromagnetic wave that can enter soft tissue, but not dense tissue like bone, 2nd shortest wave |
gamma rays | electromagnetic waves with the shortest wavelengths and highest frequencies |
opaque | material only absorbs and reflects light, no light passes through, not see through |
translucent | transmit light but also scatter it, objects on the other side looks blurry |
transparent | transmit light without scattering it, can see clearly the object on the other side |
reflection | wave bounces off the surface of material |
refraction | speed of wave changes as it passes through different mediums, and the wave bends |
mirage | refraction of light through air layers of different densities |
color | depends on the wavelength reflected by an object |
filter | transparent material that selectively transmits light |
pigment | colored material used to change the color of a substance |