physics test- light color and the EM spectrum
young double slit experiment
Presented light (of one wavelength) to two parallel slits Diffracted rays of light emerged due to interference Supported theory that light behaves as a wave constructive interference: bright, maxima fringes destructive interference: dark, minima fringes
photoelectric effect
The emission of electrons from a metal when light shines on the metal
translucent
allowing light to pass through, but blurring it so that images cannot be seen clearly; ex- frosted glass, wax paper, stain glass
What is the speed of light in a vacuum?
c= 3.00 x 10^8 m/s
similarities between mechanical and electromagnetic waves
can both be measured by their amplitude, wavelength and frequency
what is an additive process when mixing colors of light with an example
creating a new color by a process that adds one set of wavelengths to another set, ex- red+green=yellow
explain the relationship between the frequency and energy of a EM wave
if the frequency increases, the energy is greater
how do humans perceive color
light receptors within the eye transmit messages to the brain, which produces familiar sensations of color, the surface of an object reflects some colors and absorb all others
describe polarized light waves
light waves in which the vibrations occur in a single plane (transforms i polarized light into polarized light)
what are the colors of the rainbow and what is the order from the top to the bottom? what is the wavelength associated with each color?
longest———> shortest red, orange, yellow, green, blue, violet
what is the relationship between an EM wave's wavelength and it's location of the EM spectrum
lowest energy/ longest wavelength waves are at the top (radio, micro, infrared, visible, ultraviolet, x rays and gamma rays)
what are the secondary colors of light
magenta, cyan, yellow (they are made by red+green=yellow, green+blue=cyan, blue+red=magenta
differences between mechanical and electromagnetic waves
mechanical need medium to exist, fluctuations in a medium while EM waves do not propagate in a medium and made up of electromagnetic and magnetic fieds
opaque
not letting light through; ex- stone, metal and wood
what is a subtractive process with an example
occurs when colors are mixed or when several colored filters are inserted into a beam of white light; ex- white-cyan=red
which color has the longest wavelength
red
what are the primary colors of light
red, blue and green
describe the ways by which EM waves interact with matter
reflection- when waves bounce back from a surface they can't pass through ex: mirror diffraction- when waves spread out as they travel around obstacles or through openings ex: holograms refraction- change in direction of a wave ex: camera
which properties of light are constant
speed
law of reflection
states that when a wave is reflected, the angle of incidence is equal to the angle of reflection
diffraction
the process by which a beam of light or other system of waves is spread out as a result of passing through a narrow aperture or across an edge, typically accompanied by interference between the wave forms produced.
explain the relationship between the wavelength of an EM wave and it's energy
the shorter the wavelength is, the greater the energy
what is the relationship between an EM's wavelength and whether or not it poses risks to humans
the shorter the wavelength, the more damaging it is to human cells
what is a complimentary color pair
two colors that add up to white (red+cyan=white, green+magenta=white, blue+yellow=white)
which color has the shortest wavelength
violet
what determines the color of light?
wavelength
how are electromagnetic waves formed
when an electric field coupled with a magnetic field, the oscillating current creates oscillating electric and magnetic fields which in turn generate more electric and magnetic fields
what primary colors are absorbed by a surface if the reflected light is ...
white- reflected red, green and blue; absorbed none red- reflected red; absorbed green and blue cyan- reflected green and blue; absorbed red magenta- reflected blue and red; absorbed green black- reflected none; absorbed red, green and blue
transparent
(adj.) allowing light to pass through; easily recognized or understood; easily seen through or detected; ex- air, water, and clear glass
