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