A solution is made at 30°C with 100 mL of water and 90.0 g of NaNO3. Which of the following best describes
the solution?

How is it possible for someone to put an ear to a wall and hear someone in the next room?     a.sound waves can travel though solids.    b.the waves travel from room to room via air.    c.there must be some air in the wall so the sound can travel through it.    d.sound waves change to electromagnetic waves and then back again.