Marc and his brother Alex are swimming in a large lake. Marc
comes up from being underwater and tells Alex there is a boat
nearby. He heard it while underwater. Alex and Marc listen for
the boat above the water, but they do not hear it. Which
statement explains this phenomenon?
O Air, a gas, does not transmit sound.
O Sound requires a dense medium to travel through.
O Sound travels faster in water, a liquid, than in air, a gas.
○ Sound has a higher frequency in water, a liquid, than in air, a gas, and
can be heard better through water.