alleryIn a vacuum tube electrons flow only from cathode to anode, so such tubes are called:
ACells
BValves
CPumps
DGates
Answer & Solution
Correct answer: B. Valves
1. The flow is one-directional.
2. A device that passes flow one way is like a valve.
3. So vacuum tubes are called valves.
_Source: syllabus Physics Part II, Chapter 14, Semiconductor Electronics._
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