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Electromagnetic

Study guide

QuestionAnswer
Electomagnetic Spectrum A complete range of electromagnetic waves from lowest to highest. It is used to gather information about distant objects.
Waves A disturbance that travels through space and matter. They transfer energy, not matter.
Crest The highest point on a wave.
Trough The lowest point on a wave.
Wavelength The distance between successive crests or troughs.
Amplitude The maximum extent of a wave measured from the position of equilibrium.
Frequency The number of crests of a wave that move past a given point in a given unit of time.
How can an electromagnetic spectrum be described? type, scale, frequency, temperature, and more
Radio Waves Longest wavelength, lowest frequency, and coolest temperature.
Radio Wave Examples FM/AM radio stations and stars.
Microwaves Need close proximity to transmitter.
Microwave Examples Microwaves, routers, cell phones, and stars.
Infrared Waves "Infra" means below. These waves are just below visible light.
Infrared Waves Examples Remote controls, flames, lamps, and stars.
Visible Light All visible light and ROYGBIV.
Visible Light Examples light bulbs, fire, and stars.
Why do astronomers use electromagnetic waves? to study the characteristics of stars and to determine the chemical composition
Spectroscopy A measurement technique which allows astronomers to see light that is absorbed, emitted, or scattered.
Parallax Used to measure the distance of stars. Astronomers measure a star twice per year.
Ultraviolet Light Often called 'black light".
Ultraviolet Light Examples Sterilization, stars, and haunted houses.
X-Rays High frequency waves.
X-Ray Examples See inside organisms, airport security, dentist office, and stars.
Gamma Rays Highest frequency waves, and highest temperature (blue).
Gamma Ray Examples Radiation therapy (cancer), sterilization, and stars.
What is the unit of measurement for frequency? Hertz
Created by: LWehr
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