always be equal to or higher than the brightness temperature. Since the emissivity is limited by 1, the brightness temperature is a lower bound of the object’s...

In physics, a wave packet (also known as a wave train or wave group) is a short burst of localized wave action that travels as a unit, outlined by an...

Idaea ochrata, the bright wave, is a moth of the family Geometridae. It is found in Europe. The species has a wingspan of 21–24 mm. The adults fly at...

Sawtooth wave 5 seconds of 220 Hz sawtooth wave Problems playing this file? See media help. The sawtooth wave (or saw wave) is a kind of non-sinusoidal...

of the nymphs in the train of Cyrene. Ligeia was described to have bright, waving locks of hair and a slender pale neck. Ligeia, one of the Sirens. She...

comet appear significantly brighter because the dust and ice crystals are reflecting and enhancing the apparent brightness of the comet by scattering...

desalination, or pumping water. A machine that exploits wave power is a wave energy converter (WEC). Waves are generated primarily by wind passing over the sea's...

that a wave travels through. Examples of waves are sound waves, light, water waves and periodic electrical signals in a conductor. A sound wave is a variation...

coherent waves are combined by adding their intensities or displacements with due consideration for their phase difference. The resultant wave may have...

In physics, a shock wave (also spelled shockwave), or shock, is a type of propagating disturbance that moves faster than the local speed of sound in the...

is a property of transverse waves which specifies the geometrical orientation of the oscillations. In a transverse wave, the direction of the oscillation...

defines an ideal "matte" or diffusely reflecting surface. The apparent brightness of a Lambertian surface to an observer is the same regardless of the observer's...

magnitude, the brightness of a celestial object corrected to a standard luminosity distance Apparent magnitude, the calibrated apparent brightness of a celestial...

assemble faster. In contrast, the wave theory predicts the formation of an extended continuous pattern whose overall brightness increases with light intensity...

demonstrated this phenomenon, it indicated that light consists of waves, as the distribution of brightness can be explained by the alternately additive and subtractive...

A pulse wave or pulse train or rectangular wave is a non-sinusoidal waveform that is the periodic version of the rectangular function. It is held high...

to brightness changes in the image. Phase shifts themselves are invisible, but become visible when shown as brightness variations. When light waves travel...

with wavelength weighted with respect to a standardized model of human brightness perception. Photometry is useful, for example, to quantify Illumination...

In fluid dynamics, a wind wave, or wind-generated water wave, is a surface wave that occurs on the free surface of bodies of water as a result of the...

field, or evanescent wave, is an oscillating electric and/or magnetic field that does not propagate as an electromagnetic wave but whose energy is spatially...