invisible light

electromagnetic:the productionn of magnetism by electricity and the prodution of electricity by magnets.                                   

electromagnetic spectrum:all the wavelenghts of visible and invisible light in order from short(gamma rays) to long (radio).

   laser:a device that produce a thin stream of light of just a few close wavelenghts.

                                            

colors of light

prism:a cutpiece of clear glass(or plastic)with two oppositesides in the shape of a triangle or other geometric shape.          

 

spectrum: a band of colors produced when light goes through a prism.

primary color:red,green,or blue; mixing these colors can produce all the colors of the spectrum.

primary pigment: magenta,cyan,yellow;material with any of these colors absorbs one primary color of light and reflects the other two.

light and lenses

                                 opaque: completely blocking light from passing through.

transparent:letting all light through,sothat objectson the other side can be seen clearly.

translucent:letting only some light through,so that objects on the other side appaer blurry.

polarization:allowing light vibrations to pass through in only one directions.

refration:the bending of light rays as they pass from one subtance into another.

convex lens:a lens that curves outward(is thicker at the middle than at the edges)and brings light rays together.                   

                                             

 concave lens:a lens that curves outward(is thiker at the edges than at the middle)and spreads  light rays apart.                                                                       

                                                    
                                                    
                                                       

solar system

                                             inroduction                                                                                                                                    the solar system is the sun and the object traveling around it. 


                           the characterictics of each planets

                                                        the distance of each planets to the sun:
                                                               Mercury.57.9     Venus.108.2
                                                               Earth.149.6         Mars.227.9
                                                               Jupiter.778.3       Saturn.1,427
                                                               Uranus2,870       Neptune.4,497                         
                                                                Pluto.5,900 .

                                                                      
                                                              
                                              length of day 
                                                 Mercury 59 days 
                                                                          Venus 243 days
                                                                           Earth 24 hours
                                                                            Mars 24 hours
                                                                            Jupiter 9 hours 56 minutes
                                                                             Saturn 10 hours 40 minutes
                                                                           Uranus 17 hours 14 minutes
                                                                              Neptune 16 hours 6 minutes 
                                                                            Pluto 6.36 days
                                                      

      

                             
                                                                       conclution
                            And to conclute I can said that the earth is important for the solar system.

what matter is made of

element:abasic building block of matter;a pure subtance that cannot be broken down into anything simpler.      

compound:a chemical combimaton of two or more elements into a single substance.

atom:the smallest unit o an element that still has the properties of the element.

proton:a particle with a positive charge in the nucleus of an atom

neutron:an uncharged particle in the nucleus of an atom.

electron:a particle with a negative charge moving around the nucleus of an atom.

nucleus:the dense center part of an atom.

molecule:a group of more than one atom joined together that acts like a single particle.

what matter is

mass:the amount of matter in an object

volume:the amunt of space an object takes up.

weight:ameasure of the force of gravity between earth and an object

density:a measure of how the tightly packed matter is;the amount of mass contained in a given volume.

buoyancy:the upward push on an object by the liquid(or gas)the object is placed in

conduct:allow heat or electricity to flow through readily.

insulate:not allow heat or electricity to flow throught readily.

invisible light

Introduction.
The visible light can travel in straingth line and invisible light travel in waves.

Radio Waves.
Radio waves are the longest waves of the electromagnetic spectrum.

Radar.

Recall that some animals, such as bats and whales, send out sound waves with a high frequency.

Microwaves.

A microwaves oven uses electromagnetic waves, too.

Infrared light.

Infrared means "just beyond red". Infrared waves are the next to visible red waves in the spectrum.

Ultraviolet Light.

Ultraviolet (UV) light is made up of waves just shorter than vicible violet light on the spectrum.

X rays and Gamma rays.

The shortest wavelenghts of the spectrum--X rays and gamma rays-- have great penetrating power.