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44 Cards in this Set

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  • Back
energy
the ability to do work or cause a change in matter
electromagnetic radiation
the energy given off by the Sun
visible light
the type of E-M radiation that you can see
light wave
a disturbance that moves away from its starting poing
vacuum
a region that is empty of any matter
wavelength
the distance from one crest of the wave to the next crest
frequency
the number of waves produced each second
hertz
the unit by which wave frequency is measured
reflection
the bouncing back of light from a surface
plane mirror
a mirror with a flat surface
concave mirror
curves inward at the middle
convex mirror
curves outward at the middle
refraction
bending of light as it passes from one material into another
lens
a transparent object with at least one curved surface. They come in a variety of shapes, but all types refract light that passes through them
convex lens
a lens that is thicker in the center than it is at the edges
focal point
a convex lens brings parallel light rays together at a point known as ________ point.
concave lens
a lens that is thicker at the edges than at its middle
retina
the light-sensitive layer at the back of the eye
contact lenses
clear, thin lenses that are placed on the eye in front of the cornea, invented in 1965
refracting telescope
this telescope uses lenses that refract light to make an image
reflecting telescope
with this telescope, light strikes a mirror and is reflected to a focal point
Leeuwenhoek's simple microscope
a microscope that had only one lens that was held between two metal plates
compound microscope
a microscope that uses two convex lenses
electron microscope
this microscope uses a beam of electrons instead of a beam of light
opaque
means an object that light does not pass through
transparent
objects that let light pass through
trnaslucent
objects, such as frosted glass and wax paper, that let light pass through, however, light does not follow one straight-line path through the material, it is scattered in many directions
filters
colored materials that absorb some colors of light and let others pass through
vibrations
back-and-forth movements of matter
sound
a form of energy that you can hear and that travels through matter as waves
compression
the region where the sound wave particles have been pushed closer together
rarefaction
the region of sound waves where there are fewer particles than normal
crests
the up-and-down wave of a sound waves have ____________that represent compressions, or regions of greater air pressure
troughs
sound waves have ____________ that represent the rarefactions, or regions of lower air pressure
wavelength
the distance from one compression to the next in a sound wave
frequency
the number of complete sound waves produced in a unit of time, such as a second
amplitude
the _______________ of a sound wave is the distance from rest to a crest or from rest to a trough
overtones
softer, higher tones that are mixed with the basic tone
timbre
the special sound produced by a musical instrument
Thomas Edison
created a light bulb using a carbon filament made from a burned thread
an image that is larger than the object, such as with shaving and make-up mirrors
What kind of image is created by a concave mirror?
an image that is smaller than the object, such as side-view mirrors on cars
What kind of image is created by a convex mirror?
an image that is smaller than the object, but the image formed is always right side up. This image is made from a lens that is thicker at the edges than at its middle.
What kind of image is created by a concave lens?
the image that is formed is small, it is also upside down. This image is made by a lens that is thicker in the center than it is at the edges. This lens brings parallel light rays together at a focal point.
What kind of image is created by a convex lens?