Discussion
What is the effect of adding a second modulating tone at a different frequency?
Answer: D
Each tone produces its own pair of sidebands at plus and minus its own frequency, so a two-tone message gives four sidebands and the bandwidth is set by the higher tone. Continuous bands appear when the message itself is continuous, as speech is, rather than from adding discrete tones. The carrier is unaffected in amplitude. And the bandwidth certainly grows if the second tone is the higher of the two, which is why the highest message frequency is what the channel must accommodate.
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