Interference - the net effect of the combination of two or more wave trains moving on intersecting or coincident paths, pitch - How high or low a sound seems to a listener , volume - is related to the strength, intensity, pressure, or power of the sound, binary code signal - code used in digital computers, based on a binary number system in which there are only two possible states, off and on, usually symbolized by 0 and 1, analog signal - consist of continuously changing voltage in an electric circuit, electromagnetic radiation - Radiation that has both electric and magnetic fields and travel in waves, transmission - happens when a light wave travels through a medium or into a new medium., reflection - one of several ways that light can interact with matter. Light reflects off surfaces such as mirrors that do not transmit or absorb light, absorption - when a light wave comes into contact with a medium and causes the medium's molecules to vibrate and move. This vibration absorbs or takes some of the energy away from the wave and less of the energy is reflected., diffraction - when waves bend around small obstacles, or spread out after they pass through small openings., visible light - the part of the electromagnetic spectrum that is visible to the human eye, digital signal - rapid pulses of voltage that repeatedly switch the current off and on. This type of signal encodes information as a string of 0’s (current off) and 1’s (current on). ,

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