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Light Flashcards

Terms in this set (24)

Two models of light
Waves and particles
Light is a transverse wave
It does not require a medium
Light is a electromagnetic wave
A changing electric and magnetic field
Three properties of light
Reflection, Refraction, Defraction
Light is particle
Causes electrons to fly off a piece of metal
Particle model of light
Light is a bundle or packet of energy called photons
Photon
Unit or quantum of light | Does not have mass | Stream of them is a beam of light
Reflection
Wave and particle theory
Refraction
Wave and particle theory
Diffraction
Wave but not particle theory
Interference
Wave but not particle theory
Photoelectric effect
Particle theory
The energy of light
Proportional to frequency
Speed of light
Depends on the medium Air: 3.0e8m/s Water: 2.25e8m/s
Visible light
Wavelength of 400-700 nanometers
Intensity
Rate at which energy flows through a given area of space
Inverse square law
As you move farther from a light source, the intensity decreases by the inverse of the distance squared
Radio wave
Used in communication and radar 1/10m wavelength
Microwave
Used to heat food, not harmful Comes after radio waves
Infrared
Longer than red light
Ultraviolet
Slightly shorter than Violet light, and harmful to the skin
X-Rays
Used for medical purpose, discovered in 1900's
Gamma rays
Product of nuclear reaction, very very harmful
Joule
Measurement of energy
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