Waves

Waves

1. Light Waves-

   • Two ways in which light can be transformed include plants turning light into food (through photosynthesis)
   • Refraction is an optical effect where light changes speed and bends when it enters a medium with a different refractive index
   • A convex lens causes light waves to converge
   • A convex lens causes light waves to converge
   • We are able to see a beam of light when particles scatter the light.

2. Seeing Colour

   • The two parts of our eye resposible for focusing light is the cornea and the lenses
   • Short sightes people have difficulty geting a sharp image of disant objects
   • The three main colours the retina detects are red, blue, and gree.
   • The dialator and the sphincter muscles in the iris control the size of the pupil through which the light enters the eye

3. Electromagnetic Radiation

   • Sound waves are created by vibrations
   • A compression is a region which particles are pushed together closer then usual whereas a rarefaction is a region in which particles spread out more that usual
   • Frequency is a measure of the number of complete vibrations per second (hertz Hz)
   • Pitch is the quality of sound that frequency determines
   • Electromagnetic waves consist of change electric and magnetic fields
   • Sound waves are compression waves, while electromagnetic waves are transverse waves
   • Ultraviolet radiation, x-rays and gamma rays all carry more energy than visbile light