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# Physics 8 Final

what is light energy
what is a model a way of representing something that we cannot see so that we can understand it better
what is a wave a movement that transfers energy through matter or space
what is the medium the matter that moves to transfer the energy (some kinds of waves do not need a medium)
what are the two kinds of waves? transverse and compression waves
what is a compression wave? the medium moves back and forth along the same direction as the wave (parallel)
what is a transverse wave? the medium moves back and forth perpendicular to the direction of the wave
(Tor F) the medium travels with the wave. false
what is the rest position where the medium would be if it were still
what is the highest point of a wave called crest
what is the lower point of a wave called trough
what is the wavelength the distance from one crest to the next (or trough)
what is the amplitude from rest position to the crest or trough
what is frenquency the number of times the wave repeats in a given period of time
a wave with high frequency has a ______ wavelength shorter
a wave with a lower frequency has a _____ wavelength longer
do waves with shorter or longer wavelengths transfer more energy? longer. if they have the same amplitude the wave with the higher frequency has more energy
what is frequency measured in? hertz (Hz)
what is refraction the bending of a wave when it passes from one medium to another
what are the colours of the rainbow? ROYGBIV
what is white light made up of? all the colours of the rainbow
(T or F) each colour has a different wavelength and frequency True
what happens to white light when it passes through a prism it separates into the different colours of the rainbow
why do objects appear the colours they are? because they absorb the other colours and reflect the ones that they appear to be
what happens to white objects? what colours are reflected or absorbed? all colours are reflected
what happens to black objects? what colours are reflected or absorbed? all colours are absorbed
what are the additive primary colours of light red green blue
what happens when you mix red and green light you get yellow light
what happens when you mix red and blue light you get magenta light
what happens when you mix green and blue light you get cyan light
what happens when you mix green red and blue light you get white light
what are the secondary colours of light yellow, magenta, and cyan
why are red blue and green called the additive primary colours of light because they are the only colours you need to make white light
what colour bends the most in the spectrum violet
what are light waves electromagnetic waves
what is electromagnetic radiation the transmission of energy in the form of electromagnetic waves
what is the whole range of electromagnetic waves called the electromagnetic spectrum
what is the order from longest to shortest waves in the electromagnetic spectrum radio wave, microwaves, infrared, UV rays, X-rays, Gamma Rays
what are microwaves used for telecommunications, radar, and microwave ovens
what are infrared waves used for heat radiation, remote controls, and in computers to read CD ROMS
what are UV rays used for your body needs them to produce Vitamin C, cause sunburns and suntans, black lights, killing bacteria, and for crime solving
what are x-rays used for photograph bones and teeth, check machines for damage, and to check inside of baggage
what are gamma rays used for? radiation treatment to kill cancer cells
restate the ray model of light light always travels in a straight line
transparent materials allows light to pass through freely and objects can be clearly seen through them
translucent materials much of light passes through but is scattered. some light is absorbed or reflected. objects cannot be seen distinctly.
opaque materials no light passes through. light is absorbed or reflected by the object
what is the normal the line drawn at a right angles to a solid barrier such as a mirror
what is the incident ray the incoming light ray to the barrier
what is the reflected ray the light ray that bounces off the barrier
what is the angle of incidence the angle between the incident and the normal
what is the angle of reflection the angle between the reflected ray and the normal
what does the law of reflection state the angle of incidence is equal to the angle of reflection
what happens when light passes from a less dense substance into a more dense substance it slows down and bends toward the normal
what happens when light passes from a more dense substance into a less dense substance it speeds up and bends away from the normal
what is the angle of refraction the angle between the refracted ray and the normal
when you look at an object underwater, where does it appear to be? above where the object really is
when light refracts in air what do you see? a mirage
what characteristic does a substance need to have in order to reflect light? it needs to be completely flat and smooth
what are the characteristics of an image produced by a plane mirror right side up, same size as object, appears to be reversed left to right,
what type of mirror curves inward concave
what does a concave mirror do to an image if it is far away inverted and smaller
what happens to the image as it reaches the focal point of a concave mirror flips and becomes large
what happens to the light rays in a concave mirror they converge at a focal point
what is an example of a concave mirror make up mirror
what type of mirror curves outward convex mirror
what happens to the light rays in a convex mirror they diverge
what does the image look like in a convex mirror upright and smaller
what is an example of a convex mirror passenger side mirror on a car
why do we use convex mirrors on the passenger side of a car so that the driver can see more
what mirror is a concave lens like convex mirror
what mirror is a convex lens like concave mirror
in a concave lens what happens to the light rays they diverge
what does the image look like in a concave lens smaller and upright
in a convex lens what happens to the light rays they converge at a focal point
what does the image look like in a convex lens inverted and smaller before focal point, larger and upright at focal point
if the frequency increases the wavelength ______________ decreases
where does light enter? the pupil
what is the pupil an opening into the eyeball
what is the coloured muscle surrounding the pupil iris
what does the iris do adjust the size of the pupil to allow the light amount of light in
what happens when it is dim out the iris dilates the pupil
what happens when it is bright out the iris contracts the pupil
what covers the iris and pupil? the cornea
what does the cornea do it is curved so it adjust to refract the light rays so that they can form an image on the retina
what is the white part surrounding the iriss the sclera
what is behind the pupil a convex lens
what is the lens a convex lens that is flexible enough to change shape, does the final bit of focusing so that the image will form perfectly on the retina
what is the retina a black screen at the back of the eye
what is the optic nerve light rays are converged at the retina and convert into electrical signals which are sent to the brain
what happens to the lens when the object is far away it gets thinner
what happens to the lens when the object is near it gets thicker
what happens to light when it touches the retina it forms an inverted image but the brain automatically flips it
what is the small area where there are no light-sensing cells called the blind spot
what are the two main types of light detecting cells cone cells and rod cells
what are cone cells detect mainly three primary colours and their secondary colours, need lots of light
what are rod cells detect shades of light and dark
what happens to the eye when people are near sighted the eye is elongated so the light rays converge before the retina
how do we fix people that are near sighted put a concave lens in front of the light rays to bend them apart a bit
what happens to peoples eye when they are far sighted the eye becomes shorter than normal so the light converge after the retina
how do we fix people that are far sighted put a convex lens in front of the eye to make the rays converge sooner
what is common as people age their eye muscles weaken and they can no longer adjust the lens enough to focus on near by objects
what happens to the eye when people have astigmatism the cornea has a distorted shape so that images are focussed on more than one place on the retina
Created by: azra2972

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