Question

Dolphins communicate using compression waves (longitudinal waves).  Some of the sounds dolphins make are outside the range of human hearing.
Upon spotting a hungry shark, dolphin A sends a message to dolphin B.  To send this message as effectively as possible, dolphin A would

make a softer sound because the shark will not hear the softer signal.

send the message above the water when it jumps because air is more dense than water, and the sound would be louder above the water.

send the message underwater because a more dense medium would make the sound travel faster.

make a higher pitched signal because a higher pitch is a louder sound.

Answer 1

I believe the answer is A. make a softer sound because the shark will not hear the softer signal.

I say this becasue "Some of the sounds dolphins make are outside the range of human hearing." So that means the the dolphins speak at a higher wavelength then us humans and we can't hear it so they could use that to their advantage and speak at a height wavelength to each other when sharks are near. 

I could be wrong, but I think the answer is A. 

Answer 2

Answer:  A) send the message under water.

Explanation:

Dolphin A would send the message under water. Water is a much denser material than air. Dolphin sounds would be sent much faster through this medium.

 

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