LIGHT WAVES
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Transcript of LIGHT WAVES
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LIGHT WAVES
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• Light is an electromagnetic wave.
• Its motion is transverse.
• Light travels in straight lines.
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Visible light- the set of light wavelengths that stimulate the retina of the eye.
ROY-G-BIV
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VISIBLE LIGHT RANGE:
Wavelength: 400nm – 700nm
(1nm= 1x10-9m)
4x10-7m – 7x10-7m
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SPEED OF LIGHT:
c = 3 X 108m/s
This is the same for all electromagnetic waves!!!!
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AS WAVE LENGTH INCREASES, FREQUENCY DECREASES.
f (Hz)
λ (m)
V = fλ where v is always the speed of light.
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ELECTROMAGNETIC SPECTRUM
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Infrared rays- frequency is lower than visible light. Responsible for heating the earths atmosphere.(less then 4.3x1014Hz)
Ultraviolet rays- frequency higher than visible light. Responsible for skin cancer. (greater than 7x1014Hz)
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Low frequency High frequency
Infrared ROY-G-BIV ultraviolet
High λ Low λ
Low energy high energy
velocity is always 3x108m/s velocity is always 3x108m/s velocity is always 3x108m/s
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TERMSLuminous- a body that emits its own light.
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Illuminated- Body that reflects light.
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Transparent- a medium that allows light to travel through it.
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Translucent- distorts light.
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Opaque- reflects or absorbs light.
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PHOTOMETRY The study and measurement of visible light in terms of its perceived brightness to human vision.
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SOURCES OF LIGHTIncandescent light-
object gives off light when heated.
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• Neon Light – Light produced when electrons in a tube of gas are excited.
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Fluorescent light- Ultraviolet rays strike a white powder coating on the inside of the bulb causing it to glow.
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• Black light- High frequency visible light (purple) which can cause other objects to fluoresce or glow.
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LED- light emitting diode
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• Laser light- Light amplification by stimulated emission of radiation
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Laser light is monochromatic (one color) and coherent (in phase). This produces a
small beam instead of scattered light
https://www.youtube.com/watch?v=UG85VgLOdPA