In the First Half of the 20sup>th/sup> Century, AT&T Used

question 43

Short Answer

In the first half of the 20sup>th/sup> century, AT&T used vacuum tubes to construct amplifiers that made long distance telephone calls possible. AT&T funded research to develop a semiconductor replacement to the vacuum tube. The research resulted in the invention of the_________ .

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Definitions:

Distraction

Distraction involves diverting attention away from an unwanted focus, towards a different target to reduce emotional discomfort or to refocus cognitive resources.

Favorite Food

A specific food item that a person prefers over others due to taste, cultural, or personal reasons.

Placebo

A harmless substance with no therapeutic effect, used as a control in testing the efficacy of drugs.

Release of Endorphins

The process by which the body secretes endorphins, natural chemicals in the brain that block pain and create a feeling of well-being.