Luminous intensity, in photometry, is a measure of the wavelength-weighted power emitted by a light source in a particular direction per unit solid angle, based on the luminosity function, a standardized model of the sensitivity of the human eye. Luminous intensity is the perceived power per unit solid angle.
The Luminous Exposure calculator computes the luminous exposure based on the illuminance of the surface and the time of exposure.
Sound intensity or acoustic intensity (I) is defined as the sound power per unit area A. The usual context is the noise measurement of sound intensity in the air at a listener's location as a sound energy quantity.
Sunlight may be recorded using a sunshine recorder, pyranometer or pyrheliometer. Sunlight takes about 8.3 minutes to reach the Earth.
Max. luminous efficacy: black-body belongs to the Electromagnetic radiation category of constants
The luminous efficacy of a source is a measure of the efficiency with which the source provides visible light from electricity. The luminous efficacy of radiation describes how well a given quantity of electromagnetic radiation from a source produces visible light: the ratio of luminous flux to radiant flux.
The intensity S of an electromagnetic wave refers to the power per area the wave imparts if it is absorbed by a surface. The intensity is determined by the strength of the magnetic and electric fields
Magnetic field intensity is used to characterize the strength of external field i.e. the magnetic field due to the external sources (electric current) only, excluding the contribution due to material’s internal magnetic field.
The Intensity of Reflection (transmitted waves) is found using the following formula: `T=(2v_2)/(v_2 + v_1)`, where:
The Intensity of Reflection (reflected waves) is found using the following formula: `R=(v_2-v_1)/(v_2 + v_1)`, where: