Review and apply wave math, sound, light, the EM spectrum, analog/digital signals, and circuits/magnetism to mixed problems.
This unit connected mechanical waves like sound, needing a medium, with electromagnetic waves like light, needing none, plus the circuits and magnetism used to send and receive signals. Wave speed = frequency x wavelength ties the math together across every type.
As before, a strong review habit is asking what kind of wave or signal is involved, what property is being asked about, and which formula or rule applies -- turning nine weeks of topics into one connected way of thinking.
Mastery looks like: They identify which wave/signal concept or formula applies to a new mixed problem and solve it accurately.
Common stumbles: Applying "needs a medium" to light instead of only to mechanical waves; mixing up frequency and wavelength when rearranging the wave speed equation.