Light
What colours is white light made up of?
all colours
Define transparent, translucent and opaque
Transparent: all light passes through
Translucent: some light passes through
Opaque: no light passes through
What is the shape of a concave mirror?
Bent inwards, shaped like a C
how does light move or travel?
in waves
T or F: The electromagnetic spectrum has both visible and invisible light sources
True
Name 2 different types of invisible types of light
Microwaves, infrared, ultraviolet, radio waves etc.
why are translucent objects useful?
They could provide privacy while still allowing some light to come through
How does light reflect off of smooth surfaces?
light reflects in the exact angle it came in on the object
what is a ray model?
A ray model represents the possible paths a beam of light can take from one place to another
what are the primary colours of light?
green, red and blue
What term describes the visible light given off through the absorption of UV light?
Phosphorescent light
you create strained glass using tissue paper, what type of material should it be made of?
translucent
how might the angle of reflection change with bumpy surfaces?
light would be scattered in all directions
what is the difference between incoherent and coherent light sources?
coherent: light travels in a straight concentrated line example lasers
incoherent: light sources will have light spread out in many different directions away from the source itself. Example light coming from the sun, light bulbs
Why can we see our bones in x rays?
The light waves given off by x rays have enough energy to reach deep tissue and are stopped by dense materials like bones
Name all 5 light sources light can be organized into
Incandescent, bioluminescent, florescent, phosphorescent, chemiluminescent
name an object that would not create a shadow on a sunny day
anything translucent
describe applications of convex and concave mirrors
convex: creates wider field of view so often used in security settings (bank tellers, mirrors in grocery store and hospitals)
concave: creates close up images so used in dental mirrors, make up mirrors, telescopes, microscopes
13times/second.
Why do we see certain colors? If I looked at a yellow shirt why does my brain interpret that as yellow?
All the white light is absorbed by that material and only yellow is reflected in that example.
What is the difference between an incandescent light source and a fluorescent light source?
Incandescent light sources produce light as a result of being heated.
Fluorescent light sources produce light as a result of a chemical reaction occurring in a glass tube
what is evidence that light travels in straight lines?
shadows forming
Explain the differences between concave and convex mirrors in how they collect and reflect light?
Concave collects light over a large area and because of its c shape will focus light in a smaller area therefore making a larger image.
Convex mirrors are shaped like the outside of a c and will spread light out over a larger area therefore creating a wider field of view.
if opaque objects dont let light through explain how light's behaviour would change. Use a ray model to support your answer
since opaque objects do not let light through, light will move in a straight line until it hits the object. Once it hits the object light has to change directions
Explain how the different wavelengths of colors allow the rainbow to form in the order of color that it appears. Use the idea of the electromagnetic spectrum to back up your answer
The electromagnetic spectrum is organzied by wavelength. If we zoom into the visible spectrum of light the colors are organized based on wavelength and therefore energies. Violet having the highest and therefore at the bottom of the rainbow and red with the lowest and therefore at the top.