| A | B |
|---|
| medium | The material through which a wave travels is called a ___________. |
| vibrate | Waves are created when a source of energy causes a medium to ___________. |
| transverse | Waves that cause the particles to move in an upward and downward direction are called______________. |
| longitudinal | Waves that cause the particles to move back and forth are called_____________. |
| vacuum | Sound can not travel through the ____ of outer space. |
| decibels | Loudness, or sound level, is measured in units called _____________. |
| vibrations | The frequency of a sound wave is the number of ___________ that occur per second. |
| poles | Every magnet, regardless of its shape, has two magnetic ____________. |
| attract | The north and south poles of two magnets will ____________. |
| atom | The smallest type of matter made up of protons, neutrons, and electrons is a(n)… |
| nucleus | The center of an atom is called the ______. |
| protons | ____________ are positively charged particles. |
| negative | Electrons have _____________ charges. |
| electrons | In orbit around the center of an atom you will find ____________. |
| magnetic field | An electric current produces a(n)___________. |
| electric current | An electromagnet is a strong magnet that can be made by a(n)_____________. |
| repel | Charges that are alike will ________. |
| least | An electric current will always follow the path of _____ resistance. |
| only one path | In a series circuit there can be ________. |
| many paths | In a parallel circuit there can be ________. |
| refraction | Light _________ or bends as it enters a new medium. |
| concave | A lens that is thinner at the center than at the edges: |
| reflects | You see people and objects because light ________off them. |
| plane | When the surface of a mirror is flat it is a _______________mirror. |
