| A | B |
|---|
| electromagnet | a magnet made of a coil of wire around a iron core. |
| permanent magnets | made of metals such as iron, nickel, cobalt |
| magnetic fields | the area around a magnet in which magnetic forces act |
| magnetic domains | groups of magnetically aligned atoms |
| wave | a periodic disturbance in a material which travels from one region to another |
| mechanical waves | much travel through a material - water waves, waves on a rope, sound waves) |
| electromagnetic waves | waves that can travel through a vacuum |
| wavelength | distance between two crests on a transverse wave or two troughs on a transverse wave |
| frequency | number of waves per second, measured in Hertz |
| pitch | perceived frequency of a sound wave |
| period | 1/frequency |
| velocity of a wave | frequency time wavelength |
| amplitude | maximum displacement of a material from the rest position |
| reflection | partial return of a wave pattern off of an object |
| law of reflection | reflection only shows when the image surface is smooth enough to return the incoming waves -original pattern |
| refraction | the bending of a wave pattern as it enters a new substance |
| interference | interaction of waves at the same place at the same time |
| diffraction | bending of a wave around an object |
| doppler effect | the difference in frequency between a sound produced and how it is perceived by the listener |
| wavelength | distance between two compressions on a longitudinal wave |
| interference | amplitudes add at when in the same direction, but cancel when in opposite directions |
| amplitude | directly related to the amount of eregy the wave carries and how loud a sound wave is |
