nature of light
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15.2. Nature of Light. Electromagnetic waves need no medium, are produced by moving electrons in a field. Can be reflected, refracted, diffracted, produce standing waves. Waves/ particles. Tiny bundles of energy that produce light. - PowerPoint PPT PresentationTRANSCRIPT
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15.2
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Electromagnetic waves need no medium, are produced by moving electrons in a field.
Can be reflected, refracted, diffracted, produce standing waves
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Tiny bundles of energy that produce light.
They increase as frequency increases and wavelengths decrease
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Sound and Light
4
Absorbs Energy
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Light is the fastest wave in the universe
Speed of light is 300 million m/sec- it takes 8 minutes from sun to earth
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Affected by the material that it passes through
Transparent- air, water, glass Translucent- frosted glass diffuses light
Opaque-light can’t pass through.
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If light travels through an object it is =transparent
If light is blocked by an object and a dark shadow is cast it is= opaque.
If some light passes through but not all and a light shadow is present it is=translucent.
*AIMS:Primarily Physics: Just Passing Through Activity
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Quantity of amount of light illuminating a surface, dependant on amount of light.
Decreases with distance
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Sound and Light
10
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Describes physical waves using amplitude, wavelength and frequency.
Arranged by Frequency and wavelength
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Left side of spectrum has low frequency and large wavelengths, right side has high frequency and close wavelengths
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You begin with radio wave, microwaves, infrared, visible light, ultraviolet, x-rays and gamma
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Radio- lowest frequency, longest wavelength. Includes AM/FM and radar
Radar- Radio Detecting and Ranging
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Radar uses short radio impulses to locate and monitor speed once the signal is reflected back.
Microwaves follow radio waves and are used in cooking/communication
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Infrared- slightly lower wavelength than visible light
Felt has heat like in the sun and warming lamps
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Visible light – color spectrum
ROY G BIV Red, orange, yellow, green, blue, indigo ,violet
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The colors are ordered by wavelength.
50% of the sun’s light is visible
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Ultraviolet- higher frequency than visible light
Kills bacteria, causes cancer, produces vitamin D
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X-rays- frequency above ultraviolet waves, passes trough skin but is absorbed by bone, Lead can absorb all X-rays
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Gamma rays- has highest frequency and shortest wavelength, has highest energy and can penetrate 3 meters of concrete.