EM Spectrum
These EM Waves have the longest wavelength and lowest frequency
What are radio waves?
The highest point of a transverse wave
What is the crest?
This occurs when light "bounces" off a surface, like a mirror
What is reflection?
These signals use discrete, "on or off" pulses (1s and 0s) to transmit information.
What are digital signals?
TRUE/FALSE: Everything gives off radiation
true
This narrow, very thin part of the EM spectrum is the only part that the human eye can detect
What is visible light?
The distance between two troughs on a wave
What is wavelength?
The bending of light as it passes from one medium to another, and often appears "bent"
What is refraction?
These signals are continuous and vary in amplitude or frequency to represent information, like an old vinyl record.
This is the reason why a gamma ray is called a "ray" and not a "wave"
What is crazy small amplitude?
These waves are sometimes felt by humans, but never seen. They can produce heat.
That is infrared radiation?
What is amplitude?
This happens when materials take in light energy and convert it to heat
What is absorption?
Modern internet cables use this technology to transmit data as pulses of light through glass threads.
When wavelength decreases, this increases
What is freqency?
These are the most energetic waves found on the spectrum and is often associated with nuclear reactions
What are gamma rays?
This number of waves that pass a fixed point in a given amount of time is measured in Hertz
What is frequency?
Objects that allow some light to pass through it - like in a laser maze game - are called...
What is translucent?
The "clogged" sounds sometimes caught in analog signals.
What is noise?
When frequency increases, this decreases
What is wavelength?
Unlike sound waves, electromagnetic waves do not require one of these to travel through.
What is a medium (or matter)?
This workplace often uses x-rays to see hard tissues.
What is a hospital?
When white light passes through a prism, "dispersion" occurs. Dispersion is best described as
What is the ability to separate based on wavelength?
Between analog and digital, this type of signal is generally more reliable over long distances because it is easier to "clean" of noise.
What is a digital signal?
These are three examples of a mechanical wave
(based on student response)