Question

When Lisa placed a balloon to her ear, she was able to hear what her sister was whispering from the other side of the room. When she removed the balloon, she was no longer able to hear what her sister was saying. What is the best explanation for what Lisa discovered?
A) The material from which the balloon is made makes sounds seem louder.
B) There is no air pressure inside the balloon, which makes sound waves travel more quickly.
C) The air in the balloon is not as dense as the air outside the balloon, which makes sound waves echo.
D) Sound does not travel around the air outside of the balloon as well as it does through the denser air pressure inside the balloon.

Answer 1

D

Sound travels best in dense air because the molecules are close together than in less dense air.

Explanation:

Because the air is compressed in the balloon, the air molecules inside are closer together than the air molecules outside the balloon. Therefore these molecules inside the balloon can transmit the sound energy effectively. Remember sound waves are made by the transmission of the compression and rarefaction by the air molecules.

This is also the reason why solids are good transmitters of sound waves (and other mechanical waves) than air. The molecules of solids are more closely packed than those of air.

Learn More:

For more on sound transmission check out;

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Answer 2

Correct answer is D

Sound does not travel around the air outside of the balloon as well as it does through the denser air pressure inside the balloon. Sound waves travel better through denser material.