In the 1920s,the Development of Practical Radio Communication Was Furthered

question 58

Multiple Choice

In the 1920s,the development of practical radio communication was furthered by

• A) the theory of modulation.
• B) the use of vacuum tubes.
• C) its ability to receive more than just simple pulses.
• D) both the theory of modulation and the use of vacuum tubes.
• E) All these answers are correct.

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