What is the only difference between Fm1 and Fm2?

• A. Fm2 has an IFM amplifier; Fm1 does not
• B. Fm1 has IFM amplifier; Fm2 does not
• C. Fm1 and Fm2 are identical
• D. Fm1 uses different frequency bands

Answer: (B)

At the core, this is about how an intermediate-frequency (IF) stage affects a receiver’s performance. The IF stage sits after mixing and filtering and is where most of the signal gain and selectivity live. Adding an IF amplifier (the IFM amplifier) gives extra gain and often tighter filtering at the intermediate frequency, which improves sensitivity to weak signals and helps separate adjacent channels.

Therefore, the model labeled FM1 includes this IFM amplifier, while FM2 does not. That single difference explains why FM1 can deliver better performance in weak or crowded signal conditions. The other options don’t fit because FM2 not having the amplifier is the defining distinction, they aren’t identical, and there isn’t a change in frequency bands between them.