Diodes
Transistors
Conductors
None of these
Vacuum Tubes were replaced by Transistors. The second-generation computers emerged with the development of Transistors. The transistor was invented in 1947 by three scientists J. Bardeen, W.H Brattain and W. Shockley.
- Transistors were invented at Bell Laboratories in 1947. These solid-state devices rapidly replaced the bulky vacuum tube as an electronic signal regulator.
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