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36 Cards in this Set

  • Front
  • Back
How does light travel?
in straight lines
What happens when matter blocks the path of light?
absorption, reflection, refraction, or transmission
luminous object?
produces its own light
What is reflection?
Light ray bouncing off object
What is refraction?
Light bends when it travels from one medium to another.
What is transmission?
Light passes through a medium.
What is absorption?
Light is taken into the medium and changed to heat energy.
The Law of Reflection?
The angle of reflection equals the angle of incidence.
Angle of incidence
The angle the light strikes the medium (mirror for example)
Angle of reflection
The angle the light reflects off of the surface
This produces an inverted image in a mirror
Concave mirror
This produces a smaller, upright image and allows for a wider field of vision
Convex mirror
Lens that is thick in center, thinner at edges, causes rays to bend inwards or converge, image is larger than object and right side up when used upclose, smaller inverted images when used far from object
convex lens
lens that caves inward, edges thicker than center, rays bent outwards or diverge from each other, image is smaller than object and upright
concave lens
These subtract light waves ofcertain colors
filters
What are primary colors of light?
red, green, blue
What is produced when equal amounts of red, green, blue light at combined?
white light
The color you see when no light is reflected
black
transverse waves
light travels in transverse waves
crests
high points of a transverse wave
troughs
low points of a transverse wave
amplitude
distance between resting point to the crest or trough
wavelength
distance between identical points in the wave
frequency
number of waves taht pass a given point in a second, measured in hertz, Hz
What is white light?
Visible light, just one small part of a wide range of radiant energy called the EMS, electromagnetic spectrum
EMS, increasing energy
Radio waves, infrared, visible light, ultraviolet, x-rays, gamma rays
How does sound energy travel?
compressional waves
What is a compression?
area where vibrating particles, such as air, are close togheter.
What is rarefaction?
Where the particles in a sound wave at not tightly packed
What is sound?
the result of vibrations of matter
What is sound frequency?
speed at which an object vibrates, different frequencies result in high or low sounds called pitch, higher the frequency, higher the pitch
What is resonance?
To sound again, caused by vibrations of surrounding materials, ie the cup and string activity
How do sound waves travel?
in concentric circles (waves) like a pebble dropped in a pond
What is an echo?
sound waves that strike a hard object and bounce back, reflect. That reflection is called an echo.
How does sound travel through objects?
Through the molecules vibrating. Sound travels best through solid objects. Soft objects absorb the sound. Gas moles are not as tightly packed so sound does not travel as effectively, ie not so well through air.
What increases the vibrations and produces a louder sound?
amplifiers