# L I G H T - PowerPoint PPT Presentation

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L I G H T. Light carries energy A light source (sun, light bulb) gives off light waves. www.howstuffworks.com/ light-bulb.htm. Light waves …. Are like the ripples in water when you drop a rock in it Go out in all directions Are called electromagnetic waves. Light Wave Lengths are….

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### L I G H T

• Light carries energy

• A light source (sun, light bulb) gives off light waves

www.howstuffworks.com/ light-bulb.htm

### Light waves …

• Are like the ripples in water when you drop a rock in it

• Go out in all directions

• Are called electromagnetic waves

### Light Wave Lengths are…

• The distance between the tops of two adjacent ripples

### Frequency is…

• The number of wave lengths that pass a point in one second. These are some examples of different wavelengths.

### Electromagnetic Spectrum

• Electromagnetic waves are classified according to their wave lengths and frequencies

• There are many light waves that we cannot see

• We can only see a very small part of the electromagnetic waves

### Electromagnetic Waves

• As the wave length decreases the frequency increases this decides what we can see.

### Questions

• What is a light wave?

• What is a light wave length?

• What is meant by the frequency of a wavelength?

• How are electromagnetic waves classified?

• How much can we see of the electromagnetic spectrum of light?

### Works Cited

• Imagine the Universe

• http://imagine.gsfc.nasa.gov/docs/science/know_l1/emspectrum.html

• electromagnetic wave lengths

• NASA: Imaginers

• http://imagers.gsfc.nasa.gov/ems/waves2.html

• Animated wave lengths

• Visible light graphics

• Site Format

• http://www.siteformat.com/tutorials/photoshop/misc/waterripples.html

• blue ripple image

• Light bulb picture