EM Spectrum Notes Flashcards
(30 cards)
Transverse waves produced by the motion of electrically charged particles. They do not need a medium to transfer energy. They travel through a vacuum at 300,000 km/ sec. (Speed of light)
Electromagnetic wave
The transfer of energy by electromagnetic waves
Radiation
The classification of electromagnetic waves by their wavelength or frequency
Electromagnetic Spectrum
The Electromagnetic waves with the longest wavelength and lowest frequency. Some uses are radio, TV, studying space, and cordless phones. Radio station numbers are their frequencies. (98.7 The Beast) Frequencies are
Radio Wave
The electromagnetic wave energy with frequencies between 3x10^9-3x10^3 Hz. Some uses of microwaves are microwave ovens, cell phones, GPS, radar, and satellite communication.
Microwave
The EM wave energy w/ frequencies between 3 x 10^12 - 4.3 x 10^14 Hz. Some uses are cooking, thermal imaging, fiber optics, remote controls, short range communication, and security systems.
Infrared
The EM wave energy with frequencies between 4.3 x 10^14 - 10^14 Hz. Some uses of -blank- are vision, illumination, and photography. From lowest to highest the colors of the -blank- spectrum are red, orange, yellow, green, blue, indigo*, and violet.
Visible Light
The EM wave with frequencies between 7.5 x 10^14 - 3 x 10^17 Hz. Some uses of -blank- light are security markings, disinfectant, and fluorescent lights. -blank- light causes sunburns.
Ultra Violet
The EM wave with frequencies between 3 x 10^17 - 3 x 10^19 Hz. Some uses of -blank- are medical -blank-, airport security and observing the internal structure of objects. -blank- damage cells, cause cell mutation and/ or cell death.
X-Ray
EM wave given off by a radioactive atomic nucleus. They have very short wavelength, very high frequency, high energy, and are very penetrating. The EM wave with frequencies > 3 x 10^19 . Some uses of -blank- radiation are sterilizing food and medical equipment, and cancer treatment. -blank- rays damage cells, cause cell mutation, and/or cell death.
Gamma
The passage of an EM wave through a medium
Transmission
Disappearance of an EM wave into a medium
Absorption
The spreading out of light rays in all directions as particles reflect and absorb
Scattering
Materials that can be seen through because they allow nearly all light to pass through it. Ex. Air, clear glass
Transparent
Materials that transmit some light to pass through but not enough for a clear image
Translucent
Materials that don’t allow any light to pass through. You cannot see through -blank- materials
Opaque
A way of filtering light so that all the waves vibrate in the same direction
Polarization
A tool that uses refraction to separate white light into the colors of the visible light spectrum. (Red, orange, yellow, green, blue, indigo, violet)
Prism
An object has the color of the -blank-. It absorbs all other colors. A material that reflects all the wavelengths of visible light appears white. A material that absorbs all wavelengths of visible light appears black.
Wavelength it reflects
The study of light, vision, and related tech.
Optics
Picture of an object formed by waves of light
Image
The angle that light strikes a surface (angle of incidence, i) equals the angle that it reflects off the surface (angle of reflection, r)
Law of Reflection
The point at which a parallel light wave reflects from a concave mirror or a convex lens and comes together
Focal point
Distance from the center of the lens or mirror to its focal point.
Focal length
