alleryBefore 1948, electronic devices were mostly vacuum tubes. What was discovered that year?
AThe transistor
BThe vacuum diode
CThe triode valve
DThe pentode valve
Answer & Solution
Correct answer: A. The transistor
1. Vacuum tubes ruled until a solid-state device arrived.
2. That device controls current inside a solid.
3. It was the transistor, in 1948.
_Source: syllabus Physics Part II, Chapter 14, Semiconductor Electronics._
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