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17 EM Spectrum(Ch17)

Electromagnetic Spectrum - Ch. 17 Prentice Hall Science Explorer

TermDefinition
electromagnetic wave transverse waves that transfer electrical and magnetic energy
electromagnetic radiation the energy transferred through space by electromagnetic waves
electromagnetic spectrum the complete range of electromagnetic waves placed in order of increasing frequency
radio waves electromagnetic waves with the longest wavelengths and lowest frequencies
microwaves radio waves with the shortest wavelengths and the highest frequencies
radar a system that uses reflected radio waves to detect objects and measure their distance and speed
infrared waves electromagnetic waves with wavelengths shorter than radio waves, but longer than visible light
thermogram an image that shows regions of different temperatures in different colors
visible light electromagnetic waves that are visible to the human eyes
ultraviolet rays electromagnetic waves with wavelengths shorter than visible light, but longer than X-rays
X-rays electromagnetic waves with wavelengths shorter than ultraviolet rays, but longer than gamma rays
gamma rays electromagnetic waves with the shortest wavelengths and highest frequencies
altitude With four global positioning satellites (GPS) you can find your location and your_ on the Earth's surface.
AM stands for a method of transmitting signals by changing the amplitude of a wave.
amplitude The maximum distance that the particles of a medium move away from their rest position as the wave energy passes through.
basic properties The four ___ of waves are amplitude, wavelength, speed, and frequency
charged particles Electromagnetic waves are produced by _ and the electric field surrounding it which produces electric forces.
constructive The interference that occurs when two waves meet and for a moment they make a wave with a higher crest and lower trough is called interference.
crest The highest point of a transverse wave. Light is brighter here.
destructive The interference that occurs when two waves meet and the crest of one meets the trough of the other produce a wave with a lower crest, is called interference. Light is dimmer.
diffraction When a wave moves around a barrier or through the opening in a barrier, it bends or spreads out. Like light under a door. Shh the teacher is coming.
electromagnetic waves __ are waves that do not need a medium to transfer energy and they can travel through empty outer space.
FM ___ stands for a method of transmitting signals by changing the frequency (number of steps) of a wave which also changes the wavelength (size of step).
frequency The speed of all EM waves is the same, so if the size of the step (wavelength) is small, the ____ or number of waves must increase to keep up with waves of longer steps
height The point from the trough to the crest of the wave is called the ___ (not amplitude).
illuminated An object that you see because it reflects light. Moon
luminous An object you see because it gives off its own light. Sun, light bulb.
medium This is not needed in electromagnetic waves. It is needed in mechanical waves. It is the material mechanical waves travel through called a ___, it contains matter.
microwaves ___ are actually a part of the radio waves and are used for cell phones and cooking.
perpendicular Electromagnetic waves are really an electric field and a magnetic field moving at right angles or ____ to each other.
photoelectric The____ effect can be explained by thinking of light as a stream of tiny packets of energy called photons which can cause an electron to be knocked out of a substance.
photons The packets of energy sent out by electromagnetic waves. Food electrons eat or throw up.
polarized The light that passes through or vibrates in only one direction is called ___ light.
reflection When an wave hits a surface and some or all of the wave bounces back, the interaction with the surface is called ____.
refraction When a wave enters a new medium (air to water, air to glass) AT AN ANGLE, one side of the wave changes speed before the other side causing the wave to bend. This is called ___.
rest position The position of matter when energy is not traveling through it as a wave. Quiet still lake.
speed The ___ of EM waves is the same as the _ of light for all EM waves traveling in a vacuum of outer space.
T T Transverse There are two types of mechanical waves._ means "across" and these waves move up-and-down while the energy of the wave moves across.
trough The lowest point of a transverse wave.
vacuum An area like outer space where there is no matter or medium so only EM waves can take energy through here
wave A ___ is a disturbance that transfers energy from place to place.