CramPuppy - Free Revision Notes » Igcse » Physics » Light and Sound
by: Admin
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Date: Mon, 22 May 2006 Time: 12:00 AM
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Light and Sound
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Light
- Is the movement of electrons
- we see things because light rays bounce off objects into our eyes.
- Light travels in straight lines
- Principle of least time - tates light takes the path that requires the shortest time to travel
- Angle if incidence = angle of relection (angle going in = angle coming out)
A virtual image is an image that cannot be projected onto a screeen
Curved Mirrors
- Concave
- A wider area reflected into a smaller space
- Example: (
- Convex
- Shop mirrors to see around corner.
- Example: )
Refraction
- The bending og lgit when it enters a denser material.
- Light travels slower in a denser material
- Light refracts as it slows down.
- Rules:
- Rays of light entering a denser material bend towards the normal line
- Rays of light entering a less dense material bend about from the normal line
- Angle entering = angle exiting
Electromagnetic Spectrum
- They transfer energy
- can all be reflected, refracted or diffractred
- travel through a vacuum at the same speed
- travel at 300,000,000 m/s (speed of light) in vacuum
- Shorter wavelength, higher frequency, the more dangerous a wave is
You should know the spectrum, check over images of it in your books. Or check this link:www.yorku.ca/eye/spectru.htm
Seismic Waves
- S waves: Transverse, only travel through solid rock, not liquids
- L Waves: Travel along the earths crust
- P waves: Longitidinal, travel through solids and liquids
- S & P waves travel faster through denser material.
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by: Admin
Total views: 5001
Word Count: 584
Date: Mon, 22 May 2006 Time: 12:00 AM
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