alleryFrom the mid-1960s, what replaced vacuum tubes in electronics?
AThe transistor
BThe telegraph key
CThe semaphore tower
DThe homing pigeon
Answer & Solution
Correct answer: A. The transistor
1. Vacuum tubes amplified signals for much of the 20th century.
2. Semiconductor devices made smaller, cheaper and more durable parts possible.
3. Starting in the mid-1960s, the transistor replaced vacuum tubes.
_Source: Wikipedia, Telecommunications, Vacuum tubes_
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