$which describes diffraction of light$

Photoluminescence whose radiation is located in a spectral region of shorter wavelengths than that of the exciting radiationĬaused by imploding bubbles in a liquid formed by sound waves Luminescence caused by the impact of electrons on certain types of luminescent materials, such as the coating on a television screenĮmitted radiation has a shorter wavelength than the absorbed radiation Thermally activated luminescence luminescence occurring when a previously excited luminescent material is heatedĬRT displays in 20th century TVs and computers Occurs when a previously excited material is heated Occurs when a solid is under changing mechanical stress Luminescence caused by the action of mechanical forces Peeling transparent tape, biting Wint-O-Green Life Savers Occurs when a solid is rubbed or scratched (or ripped or crushed) Luminescence caused by energy released by a chemical reactionĬhemiluminescence occurring in living organisms Luminescence caused by x-rays or radioactive radiationĬaused by energy released in a chemical reaction Luminescence caused by the action of an electric field in a gas or in a solid materialĬaused by the absorption of x-rays or radioactive radiation Some outdoor advertising, some nightlights Technically, the term 'phosphorescence' should be used only for the delayed emission due to a 'forbidden transition' from an excited triplet state to a ground singlet state.Ĭaused by the action of an electric field Fluorescence is due to an 'allowed' transition generally from an excited singlet state to a ground singlet state.Įmission is 'delayed' after excitation by more than 10 nsĭelayed emission of optical radiation which appears 10 ns or longer after the excitation. Radiation is emitted within 10 ns of excitationĮmission of optical radiation when a substance is exposed to any type of electromagnetic radiation, where the emitted radiation generally appears within 10 ns after the excitation. Luminescence caused by absorption of optical radiation Includes fluorescence and phosphorescence Types of luminescence with special names typeĬaused by absorption of optical radiation (IR, light, UV) (in matter that may or may not be 'hot'). Luminescence is the emission of light when excited electrons fall to lower energy levels.Incandescence is the emission of light from 'hot' matter (T ≳ 800 K).Thomas Young (1773–1829) and Augustin-Jean Fresnel (1788–1827) disproved Newton's corpuscular theory.Huygens stated that an expanding sphere of light behaves as if each point on the wave front were a new source of radiation of the same frequency and phase.

$which describes diffraction of light$

In 1678, Christiaan Huygens (1629–1695) published Traité de la Lumiere, where he argued in favor of the wave nature of light.

$which describes diffraction of light$

The transverse nature of light can be demonstrated through polarization.

$which describes diffraction of light$

Like all electromagnetic waves, light can travel through a vacuum. The wave nature of light was first illustrated through experiments on diffraction and interference. Light is a transverse, electromagnetic wave that can be seen by the typical human.

$which describes diffraction of light$

Which describes diffraction of light