Question

LASER is an acronym for light amplification by-
a. Stimulated energetic radiation
b. Spontaneous emission of radiation
c. Stimulated emission of radiation
d. Spontaneous emission of radio waves

Answer 1

Hint: LASER is a device that emits a coherent beam of light, it is produced through the stimulated emission of the visible light or any other electromagnetic radiation. It is very useful in science experiments and has applications in industries as well.

Complete step by step answer:
The Laser uses electricity or any other type of electromagnetic radiation to produce a light ray that is coherent and can be easily focused. The coherence light emitted by a laser does not allow the beam to spread out much over great distances. They can be created in such a way that they can produce a wide variety of electromagnetic radiation like Ultraviolet rays, Infrared rays, X-rays, monochromatic or pulses of broad-spectrum.

Therefore, LASER is the acronym for Light Amplification by Stimulated Emission of Radiation.
Hence, the correct answer is option (B).

Additional information
When an electron gains energy, it transitions to the “excited level”, it comes down to the “ground level” (low energy state) after emitting a photon. If this process occurs by itself, this is known as spontaneous emission, if it is done by the means of electricity or another form of energy, then it is known as “stimulated emission”. The lasers work through the stimulated emission of radiation.

Lasers are used in industries as cutting tools, they can be used as pointers while shooting, they can be used as coherent sources of light in science experiments, in the medical field they are used for surgeries and various skin treatments. They are also used in printers, bar-code scanners, fiber-optic, and free-space optical communication. With time, lasers are finding a wide range of applications in various fields.

Note: The other light sources like a bulb or fluorescent light work because of spontaneous emission, whereas a laser works because of stimulated emission. This is why the properties of laser lights can be easily controlled.