Discussion
Which parameter is quoted in radians?
Answer: A
The PM index is a phase and therefore in radians, and it is unusual among modulation parameters for having a natural unit at all. FM deviation is a frequency in hertz. The AM index is a dimensionless amplitude ratio. And bandwidth is a frequency. Checking units is a quick way to spot a wrong formula, since an index and a deviation can never be interchanged without a frequency somewhere in between.
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