Transistor timeline: Identify the decade when the transistor was invented. Context: Consider the Bell Labs breakthrough that replaced vacuum tubes in many applications. Choose the correct decade.

Difficulty: Easy

1930s
1940s
1950s
1960s

Correct Answer: 1940s

Explanation:

Given data

Device: Transistor.

Concept / Approach
The first point-contact transistor was demonstrated at Bell Labs in 1947 by Bardeen and Brattain, with important theory and follow-ups by Shockley — all in the 1940s.

Verification
Nobel Prize in Physics 1956 awarded for the 1947 invention and subsequent work.

Final Answer
1940s.

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