The detection of reflected sound waves is utilized in ultrasound imaging. Sound waves are audible if the sensory elements of the ear vibrate in response to exposure to these vibrations. When mechanical energy is transmitted through solids, liquids, and gases, oscillating pressure waves known as “sound” are generated. The photon model of light explains why electromagnetic radiation of different wavelengths interacts differently with matter. Interference and diffraction of light waves are used in many analytical and diagnostic techniques. Differential absorption of electromagnetic radiation can be used to generate images useful in diagnostic medicine. When light interacts with matter, spectroscopic changes occur that can be used to identify the material on an atomic or molecular level. The properties of light are exploited in the optical elements of the eye to focus rays of light on sensory elements. The behavior of light depends on its frequency (or wavelength). Light is a form of electromagnetic radiation - waves of electric and magnetic fields that transmit energy.
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