1. Vacuum Tube 2.Transistors 3.Integrated circuits 4.Computer chips Yes, i know they are all in the same order, but the answers are correct, i just did this lesson and got a 100%.
1. Vacuum Tube: <em>First generation</em> <u>1940 - 1956</u> The first computer systems used vacuum tubes for circuitry and magnetic drums for memory, and were often enormous, taking up entire rooms.
2. Transistors: <em>Second generation</em><u>1956 - 1963</u> The world would see transistors replace vacuum tubes in the second generation of computers.
3. Integrated circuits: <em>Third Generation.</em> <u>1965 - 1971. </u>The computers of third generation used Integrated Circuits (ICs) in place of transistors.
Income inequality in the United States is the extent to which income is distributed in differing amounts among the American population. It has fluctuated considerably since measurements began around 1915, moving in an arc between peaks in the 1920s and 2000s, with a 30-year period of relatively lower inequality between 1950 and 1980.