Question

How is laser different from sunlight? A laser makes the pits in the surface of the DVD and another laser is needed to read it one is low power and the other is high power laser. which is which?​

Answer 1

Answer:

laser is device that emits coherent and monochromatic light. The light is coherent if photons that compose the light are in-phase, and monochromatic if the photons have a single frequency (color). When a gas in the laser absorbs radiation, electrons are elevated to different energy levels. Most electrons return immediately to the ground state, but others linger in what is called a metastable state. It is possible to place a majority of these atoms in a metastable state, a condition called a population inversion.

Answer 2

laser is device that emits coherent and monochromatic light. The light is coherent if photons that compose the light are in-phase, and monochromatic if the photons have a single frequency (color). When a gas in the laser absorbs radiation, electrons are elevated to different energy levels. Most electrons return immediately to the ground state, but others linger in what is called a metastable state. It is possible to place a majority of these atoms in a metastable state, a condition called a population inversion.

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