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Learn about the types, hazards, and effects of electromagnetic radiation on human health. Find out how exposure to different frequencies of EM waves can cause burns, cancer, or other health problems.
Learn about the full range of electromagnetic radiation, organized by frequency or wavelength, and its history and discovery. Find out how different types of waves are produced, interact with matter, and have practical applications.
Learn how noise exposure can cause hearing loss, tinnitus, hypertension, cardiovascular problems, and other health issues. Find out the sources, mechanisms, and evidence of noise-induced health effects from this comprehensive article.
A monochromatic wave (a wave of a single frequency) consists of successive troughs and crests, and the distance between two adjacent crests or troughs is called the wavelength. Waves of the electromagnetic spectrum vary in size, from very long radio waves longer than a continent to very short gamma rays smaller than atom nuclei.
Hearing is the ability to perceive sounds through an organ, such as an ear, by detecting vibrations as periodic changes in the pressure of a surrounding medium. Learn about the structure and function of the human auditory system, the types and degrees of hearing loss, and the methods to measure and improve hearing.
The frequency of a sound is defined as the number of repetitions of its waveform per second, and is measured in hertz; frequency is inversely proportional to wavelength (in a medium of uniform propagation velocity, such as sound in air). The wavelength of a sound is the distance between any two consecutive matching points on the waveform.
The microwave auditory effect is the perception of sounds induced by pulsed or modulated radio frequencies. It is also known as the Frey effect or voice to skull (V2K) technology, which is a conspiracy theory that claims government agents can transmit sounds and thoughts into people's heads.
Radiation is the emission or transmission of energy in the form of waves or particles through space or a material medium. Learn about the different types of radiation, such as electromagnetic, particle, acoustic and gravitational, and how they can be ionizing or non-ionizing, harmful or beneficial.