Which of the following gems is commonly used in creating lasers? a. rubies c. emeralds b. quartz d. diamonds

The answer is A.

Rubies are commonly used in creating lasers; this gem was used in the first lasers, although nowadays synthetic rubies are used more often due to their low cost in comparison to the real gem.

Ruby lasers are mostly used as a light source for medical and cosmetical procedures.

well, paralell is parallel. i am providing links to .

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a series circuit is one with all the loads in a row. there is only one path for the electricity to flow. if this circuit was a string of light bulbs, and one blew out, the remaining bulbs would turn off.

unlike in series circuits, a charge in a parallel circuit encounters a single voltage drop during its path through the external circuit. the current through a given branch can be predicted using the ohm's law equation and the voltage drop across the resistor and the resistance of the resistor.

a parallel circuit has certain characteristics and basic rules: a parallel circuit has two or more paths for current to flow through. voltage is the same across each component of the parallel circuit.