Light and Sound

Light and Sound

1. Light:

   • Light carries energy and travels in straight waves
   • Direct light travels straight from the object to the eye
   • In reflection there is an angle of incidence and a reflected angle
   • The angle of incidence should match the angle of reflection
   • when light goes from a less dense medium to a more dense medium the light bends away from the normal
   • In ray diagrams with reflection you use a dotted line for the normal and a line with dashed lines below for the normal
   • Lenses-A concave lens spreads out the light and the convex lens focuses the light rays
   • When white light passes through a prism it creates a spectrum of the colours that make up white light

2. Sound

   • A sound wave has a trough and and a peak.
   • The wavelength is measured from peak to peak or trough to trough
     • The amplitude is measured from the normal to the edge of the peak
   • Frequency is how many waves pass a point in a second
   • Measured in hertz