Edwin Howard Armstrong is associated with which major development?

Edwin Howard Armstrong is associated with which major development?

• A. FM (frequency modulation) radio
• B. Amplitude modulation (AM) radio
• C. Television broadcasting
• D. The phonograph

Answer: (A)

The development being tested is frequency modulation, or FM, radio. FM encodes sound in the carrier’s frequency rather than its amplitude, which makes the signal much less affected by static, electrical noise, and weather—issues that routinely degrade AM broadcasts. Edwin Armstrong pioneered, demonstrated, and helped bring practical FM broadcasting to the public, delivering noticeably clearer and more reliable audio reception. The other options point to technologies associated with different inventors and milestones, while Armstrong’s landmark contribution is the invention and advancement of FM radio.

The development being tested is frequency modulation, or FM, radio. FM encodes sound in the carrier’s frequency rather than its amplitude, which makes the signal much less affected by static, electrical noise, and weather—issues that routinely degrade AM broadcasts. Edwin Armstrong pioneered, demonstrated, and helped bring practical FM broadcasting to the public, delivering noticeably clearer and more reliable audio reception. The other options point to technologies associated with different inventors and milestones, while Armstrong’s landmark contribution is the invention and advancement of FM radio.