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LIGHT WAVES

Date post: 05-Feb-2016
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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 - PowerPoint PPT Presentation
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LIGHT WAVES
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Page 1: LIGHT WAVES

LIGHT WAVES

Page 2: LIGHT WAVES

• Light is an electromagnetic wave.

• Its motion is transverse.

• Light travels in straight lines.

Page 3: LIGHT WAVES

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

Page 5: LIGHT WAVES

SPEED OF LIGHT:

c = 3 X 108m/s

This is the same for all electromagnetic waves!!!!

Page 6: LIGHT WAVES

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

Page 8: LIGHT WAVES

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)

Page 9: LIGHT WAVES

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


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