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Intensity (physics) In physics, the intensity or flux density of radiant energy is the power transferred per unit area, where the area is measured on the plane perpendicular to the direction of propagation of the energy. In the SI system, it has units watts per square metre (W/m 2 ), or kg ⋅ s −3 in base units.
Sound intensity, also known as acoustic intensity, is defined as the power carried by sound waves per unit area in a direction perpendicular to that area. The SI unit of intensity, which includes sound intensity, is the watt per square meter (W/m 2 ). One application is the noise measurement of sound intensity in the air at a listener's ...
Radiant intensity, denoted Ie,Ω ("e" for "energetic", to avoid confusion with photometric quantities, and "Ω" to indicate this is a directional quantity), is defined as [1] where. Ω is the solid angle. In general, Ie,Ω is a function of viewing angle θ and potentially azimuth angle. For the special case of a Lambertian surface, Ie,Ω ...
Luminous intensity, a photometric quantity measured in lumens per steradian (lm/sr), or candela (cd) Irradiance, a radiometric quantity, measured in watts per square meter (W/m 2 ) Intensity (physics), the name for irradiance used in other branches of physics (W/m 2) Radiance, commonly called "intensity" in astronomy and astrophysics (W·sr − ...
Intensity (measure theory), the average value a measure assigns to an interval of length one. Exercise intensity, a measure of how much work is done during exercise (% of max heart rate) Intensity (novel), a 1995 novel by Dean Koontz. Intensity (film), a 1997 made-for-TV movie based on the novel. Intensity (Charles Earland album), 1972.
Irradiance. In radiometry, irradiance is the radiant flux received by a surface per unit area. The SI unit of irradiance is the watt per square metre (W⋅m −2 ). The CGS unit erg per square centimetre per second (erg⋅cm −2 ⋅s −1) is often used in astronomy. Irradiance is often called intensity, but this term is avoided in radiometry ...
An informal method to determine optimal exercise intensity is the talk test. It states that exercise intensity is “just about right”, when the subject can “just respond to conversation.” The talk test results in similar exercise intensity as the ventilatory threshold and is suitable for exercise prescription. Intensity Levels
Luminance is a photometric measure of the luminous intensity per unit area of light travelling in a given direction. [1] It describes the amount of light that passes through, is emitted from, or is reflected from a particular area, and falls within a given solid angle . The procedure for conversion from spectral radiance to luminance is ...