Which is true about FM radio?

Question

BlackTom AI · Accepted Answer

Question: Which is true about FM radio?

Option 1: It is more prone to electrical disturbance than AM radio.
- This statement is generally false. FM is less susceptible to amplitude (power) fluctuations and electrical noise than AM, because FM encodes information in frequency variations rather than amplitude. The noise on a broadcast is often amplitude-based, so FM tends to be more robust in the presence of certain disturbances.

Option 2: The postwar years saw a marked decline in FM broadcasting.
- Historically, FM broadcasting did not decline in the postwar years; it expanded in popularity after the war as receivers became more common and the higher fidelity audio became desirable. This option contradicts the historical trajectory of FM.

Option 3: Trumpets, saxophones, and the drum set could not initially be broadcast on FM radio because of the timbre of those instruments.
- This is not accurate. The timbre of instruments is not a fundamental barrier to FM broadcasting. Early FM faced technical and adoption hurdles, but not a blanket prohibition based on instrument timbre. The claim misrepresents the technical reasons for any initial limitations.

Option 4: It offered better sound quality than AM radio.
- This statement is true. FM (Frequency Modulation) provides higher fidelity and better sound quality due to greater resistance to amplitude noise and wider available bandwidth for stereo and high-fidelity audio, making it the standard for music broadcasting.

Option 5: FM stands for flowery music, a reference to the sentimental songs first heard on FM radio.
- This is false. FM stands for Frequency Modulation, a technical description of how the carrier signal is varied to encode information. It has no relation to “flowery music.”

Summary reasoning:
- The false choices 1, 2, 3, and 5 either misstate the susceptibility to noise, mischaracterize historical trends, rely on incorrect technical premises about timbre, or repeat a debunked etymology. Only option 4 aligns with the established advantage of FM radio in sound quality due to modulation method and broadcast design.
- The correct concept to hold is that FM provides better sound quality than AM because frequency modulation offers improved noise resistance and higher fidelity, which is a central reason FM became the preferred method for music broadcasts.

Which is true about FM radio?Single choice

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