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LIGHT WAVES

LIGHT WAVES. Light is an electromagnetic wave. Its motion is transverse . Light travels in straight lines. Visible light- the set of light wavelengths that stimulate the retina of the eye. R O Y - G - B I V. VISIBLE LIGHT RANGE: Wavelength: 400nm – 700nm

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LIGHT WAVES

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  1. LIGHT WAVES

  2. Light is an electromagnetic wave. Its motion is transverse. Light travels in straight lines.

  3. Visible light- the set of light wavelengths that stimulate the retina of the eye. ROY-G-BIV

  4. VISIBLE LIGHT RANGE: Wavelength: 400nm – 700nm (1nm= 1x10-9m) 4x10-7m – 7x10-7m

  5. SPEED OF LIGHT: c =3 X 108m/s This is the same for all electromagnetic waves!!!!

  6. AS WAVE LENGTH INCREASES, FREQUENCY DECREASES. V = fλ where v is always the speed of light. f (Hz) λ (m)

  7. ELECTROMAGNETIC SPECTRUM

  8. 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)

  9. Low frequency High frequency InfraredROY-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

  10. TERMS Luminous- a body that emits its own light.

  11. Illuminated- Body that reflects light.

  12. Transparent- a medium that allows light to travel through it.

  13. Translucent- distorts light.

  14. Opaque- reflects or absorbs light.

  15. SOURCES OF LIGHT Incandescent light-object gives off light when heated.

  16. Neon Light – Light produced when electrons in a tube of gas are excited.

  17. Fluorescent light- Ultraviolet rays strike a white powder coating on the inside of the bulb causing it to glow.

  18. Black light- High frequency visible light (purple) which can cause other objects to fluoresce or glow.

  19. Laser light- Light amplification by stimulated emission of radiation. Electrons in gas gain energy from a current. This is amplified by reflecting mirrors and in turn gains energy.

  20. Laser light is monochromatic (one color) and coherent (in phase). This produces a small beam instead of scattered light

  21. USES FOR LASERS 1) Medical Field • Correcting vision • surgery • Correcting skin imperfections 2) Electronics: • CD and DVD players ( and blue ray discs) • Supermarket Scanners • Laser light shows 3)Fiber optics: computers, internet, phones, cable TV- for transferring information and data. 4) Industry: Cutting, blasting, and welding

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