Englishfor English speakers
laser
Noun
—
A laser is a device that emits light through a process of optical amplification based on the stimulated emission of electromagnetic radiation.
—
The term laser originated as an acronym for "light amplification by stimulated emission of radiation".
flash
Noun
—
A flash is a sudden bright light.
He used the flash on his camera.
—
A flash is a very fast period of time.
The tall man disappeared in a flash.
flash
Verb
—
If something flashes, it shines brightly and suddenly.
The fountain flashed in the sunshine.
It rained hard. flashed and we heard thunder.
The light from the car flashed through the window into the house for a second when the car drove past.
photolysis
noun
—
chemical reaction