Chapter 9 Test Flashcards
Define electromagnetic radiation
The energy that the wave transfers through matter and space
Define electromagnetic wave
A disturbance that involves the transfer of electric and magnetic energy
Electromagnetic energy can travel through..
Empty space because it doesn’t require A median to travel through
What is a electromagnetic wave made up of
Vibrating electric and magnetic fields that move through space or some medium at the speed of light
The suns energy arrives on earth as what
Electromagnetic radiation
Define crest
Top of a wave
Define wavelength
The distance between the crest of one wave in the crest of the next
Define frequency
The number of ways that pass a given point in a certain amount of time
What happens to electromagnetic waves and they travel through a vacuum
All electromagnetic waves travel at the same speed in a vacuum but they have different wavelengths and different frequencies
Define vacuum
A space that contains no air other gases
the relationship between frequency of a wave in its energy
The higher the frequency of a wave to higher its energy
What does a spectrograph show
That the suns radiation includes all these different types of waves
Define electromagnetic spectrum
The complete range of electromagnetic waves placed an order of increasing frequency
Order of the electromagnetic spectrum
Radio waves microwavea infrared rays visible light ultraviolet radiation from x-rays and gamma rays
Infrared rays
Invisible heat from something given off, heat Rays
Law of reflection
The angle of reflection equals the angle of incidence
Define image
A copy of the object form by reflected or refracted rays of light
Two different types of reflection
Regular reflection and diffuse reflection
When does diffuse reflection occur
When parallel rays of light hit an uneven surface
Plane mirror
A flat sheet of glass that has a smooth, silver covered coating surface on one side. The image is Virtual Upright Same size as the object
Virtual image
An image that forms where light seems to come from
Real image
Forms when light rays actually meet
Concave mirrors
A mirror with a surface that curves inward like a bowl
Optical axis
An imaginary line that divides the mirror in half
Define focal point
The point at which rays parallel to the optical axis reflect and meet
Object is farthest away from a concave mirror
Upside down image
Image is smaller
Real image
Image is a medium distance from a concave mirror
Image is larger
Upside down
Real
Object is close to a concave mirror
Image is bigger
Right side up
Virtual
Object in a convex mirror
Virtual
Upright
Smaller
When light hits an object it can be
reflected refracted or absorbed
The more transparent an object is…
Tell the relation ship between light and clear glass
The less light it will absorb
All light passes through clear glass
Define and opaque object
Relationship between light and solids
An opaque object will both reflect and absorb light
No light passes through a solid
Define translucent
Translucent allows some light to pass through but not all
Refraction can cause you to see
Something that may not actually be there
What happens when light is passed from one medium to the next
It is refracted
Define index of refraction
A measure of how much a light ray bends when it enters that medium
