Urban concentration, education, rising literacy, and more leisure time helped transform newspapers into a mass medium.
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Q31: Edwin Armstrong is most closely associated with
A)Audion.
B)mechanical
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A)AM
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Q35: James Clerk Maxwell proved Hertz's theory by
Q36: Maritime tragedies such as the Titanic sinking
Q37: Among the earliest of radio "broadcasts" was
Q38: Despite many other claims based on earlier
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