Can u plz help here.​

The wave shown on the electromagnetic spectrum disturb the medium it passes through a)different frequency. b)the same frequency .

2. how is heavy water different from normal water

Which is a chemical property of iron? a. it forms iron oxide (rust) when exposed to moisture and air. b. it is a gray–black metal that is hard to the touch. c. it has a melting point of 2795°f (1536°c). d. it is a good conductor of heat