Answer the following question: Fact 1: Aradio converts electrical energy into vibrations. Fact 2: Sound waves are vibrations in matter. Given the two facts above, what type of waves to radios use?

Possible answers:
(a). Electrical;
(b). TRH;
(c). energy;
(d). Light;
(e). bent;
(f). Sound;
(g). Magnetic;
(h). similar;
Answer:
(f).