Wave+interactions

=__Wave interactions__=

Definitions of;

 * === Interference- Interference usually refers to the interaction of waves that are correlated or coherent with eachother. [[image:365px-Interference_of_two_waves.svg.png]] [[image:Two_sources_interference.gif]]===


 * === Reflection- Reflection is an amount of heat, light or energy that is thrown back in such a way. ===


 * === Refraction- is the turning or bending of any wave, such as a light or sound wave,when it passes from one medium into another of different optical density. ===


 * == Diffraction- A change in the directions and intensities of a group of waves after passing by an obstacle or through an aperture whose size is approximately the same as the wavelength of the waves.==

1. If parallel light waves hit a very smooth surface such as a polished car bonnet, will they remain parallel after reflection?
The Law of reflection is that when a ray of light reflects off a surface, the angle of incidence is equal to the angle of reflection and the incident, normal and reflected ray is the same.

2.If parallel light waves hit a rough surface, what will happen to the reflected light waves?
Some of the light is always reflected. However, when a ray of light goes from a denser medium to a rarer medium, all the light will be reflected if the angle of incidence is greater than the critical angle. (The critical angle is the angle of incidence for which the refracted ray is at 90 degrees with the normal).

3.Does sound reflect off surfaces?
Yes, sound does reflect of surfaces.

4.Why do drum kits have a Perspex shield around them?
Having a Perspex shield around a drum kit is able to control the sound of the kit direct to the mixing desk via a condenser mic. This enables us to contain the sound within the stylish clear perspex screen.

5.Who were the first people to use mirrors?
An ancient man must had looked into ponds of still water and seen his image and perhaps quite by accident he noticed that polished bits of metal reflected image. So, he became the first user of mirror. It impossible to find out who was he. Then "the man" deliberately took pieces of metal and shaped and polished them to make mirrors.

6.What property of light can be explained by using mirrors?
One of the properties of light is that it reflects off surfaces.

7.What is an angle of incidence and an angle of reflection?
The angle of reflection = angle of incidence

'To get a right reflection, you need to know how to position the reflector to direct the light from your original light source'

http://en.wikipedia.org/wiki/Light

http://www.blurtit.com/q945102.html http://www.physicsplanet.com/articles/properties-of-light http://www.photoflexlightingschool.com/Lighting_Principles/Secondary_Reflectors/Angle_of_Reflection___Angle_of_Incidence/index.html