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