Chapter 4 Key Words Flashcards
Crest
Highest point in a wave
Amplitude
Height of the crest or the depth of a trough.
Energy
The ability to do work
Frequency
Number of repetitive motions that occur in a given time
Trough
The lowest point in a wave
Wave
A way of transferring energy through matter or space, without causing any permanent displacement
Wavelength
The distance of one complete wave: crest to crest or trough to trough.
Light
A natural agent that stimulates sight and makes things visible
Reflection
When light strikes an object and it bounces off
Refraction
When light bends or changes direction as it changes speed
Spectrum
Seven colour categories of visible light that are together
Visible light
Light that you can see
Wave model of light
Light is a type of wave that travels through empty space snd transfers energy
Electromagnetic spectrum
(EM) energy that is carried, or radiates, in the form of waves that range in length from short to long; xrays, ultraviolet rays, visible light, microwaves and radio waves
Radio waves
Longest wavelength, AM radio is 1 km long. Examples: AM/ FM radio, tv/ cell phone, MRI
Microwaves
A type of radio wave, about 1 km long. Examples: Microwave oven , communication
Infrared waves
About 1000 waves can fit into 1 cm. Emitted by living things & warm objects. Ex: heat lamps, remote controls
Visible waves
ROYGBIV. Examples: artificial light, lazers
Ultraviolet waves
1M waves fit in 1 cm, needed to make vitamin d, can cause skin cancer. Examples: skin tanning, kill bacteria
X rays
100 M waves fit in 1 cm, passes through skin but not bones. X ray photos, airport security
Gamma rays
Shortest wavelength. 10 B waves in one cm. Examples: radiation therapy, study galaxies
What is the acronym for the EM spectrum?
Rainbow may invite violent unicorns with X-ray goggles (RMIVUXG) : radio, microwaves, infrared, visible, ultraviolet, X-ray and gamma
