Light Waves Flashcards
Def of electromagnetic waves
Light, is a form of energy that does not need a medium to travel through
Radio waves
Satellite radio, traditional T.V., phones, wireless networks etc.
-used to change into sound
Microwaves
Wireless networks, cell phone towers, microwave ovens, weather radar, radio astronomy
-Electrical to light
Infrared
Heat lamps, thermography, night vision googles, short range communications
-Associated with heat (not visible)
Visible
Finger prints
-(low energy) red, orange, yellow, green, blue, violet (high energy)
-what we can see
Ultraviolet
Pest control, vitamin D, fluoresce, forensics, sterilization
X-rays
Medicine, x-ray astronomy
-Radiation
Gamma rays
Medicine, gamma ray astronomy, security
-Lasers
List the waves of light from LOWEST to HIGHEST
Radical
Martians
Invaded
Venus
Using
X ray
Guns
Non-Ionizing
Light giving off (visible)
-Radio
-Microwave
-IR
-Visibke
Can repair if harmed (safe)
Ionizing
Dangerous
-Can’t repair
-UV
-X rays
-Gamma rays
Newtons theory on light
Light is a Particle
-It can reflect and refract
—But waves can also reflect and refract
Young’s theory
Light is a wave
-It can interfere (constructive and destructive)
-Light diffracts(rainbow smeres)
-Particle CANNOT interfere
Fresnel
Light is a wave
-air can diffract
-Particles CANNOT diffract
Malus
Light is a wave
-can be polarized
Interference
Multiple waves interacting with one another
EX = CDs and DVDs
Polarization
Blocks waves (transverse) that aren’t vibrant in up & down
EX = the black magic squares rotating them at a 90 degree angle
Refraction
the change in direction of a wave passing from one medium to another caused by its change in speed
Reflection
When the waves bounce off a surface or object and does not absorb the radiation
Diffraction
Bending around a barrier
Doppler effect
Color changes because of its speed
-Blue/violet light = high frequency and shorter wavelength
-Red light =low low frequency and longer wavelength
Young’s double split experiment
light is passed through two slits and forms an interference pattern on a screen behind the slits
Einsteins photoelectric effect
a phenomenon in which electrons are ejected from the surface of a metal when light is incident on it
-Light has particle like activity
When light is in a more dense medium it will… what will happen to the second medium?
It will bend AWAY from the normal line
