All terms in this list:

SOUND WAVE: longitudinal wave
caused by vibrations
travels through a "material" medium

PITCH: measure highs and lows of sound
depends on the frequency of the sound wave

ULTRASOUND: sound wave with frequencies higher than 20,000 Hertz (Hz)

INFRASOUND: slow vibrations of frequencies "lower" than 20 Hertz (Hz)

RESONANCE: occurs when two objects "naturally" vibrate at the same frequency, one object's sound causes the other object to vibrate

SONAR: Sound Navigation And Ranging system that uses "acoustic" signals that return "echoes" to the location of the object.

PHOTON: quantum of light, particle of electromagnetic radiation, carries quantum energy

INTENSITY: the rate at which energy flows through a given area of space

RADAR: Radio Detection And Ranging system uses "reflected" radio waves to determine velocity and location of objects.

LIGHT RAY: line in space that matches the direction of the flow of "radiant" energy

VIRTUAL IMAGE: an image that forms at a point from which light rays appear to come but do not actually come

REAL IMAGE: an image of an object that forms when rays of light go through a lens and intersect at a single point

LENS: transparent object refracts light waves, they converge or diverge to create an image

MAGNIFICATION: increase of an objects apparent size by using lenses or mirrors

PRISM: a system that consists of two or more plane surfaces of a transparent solid at an angle with each other

DISPERSION: the process of separating a wave (eg. white light) of different frequencies into its individual component waves (different colors)