Aimee and Patrick are playing hide-and-seek on a summer day. Aimee gives Patrick a clue to her location by knocking three times every 30 seconds. Which characteristic of waves makes this a useful clue to help Patrick find Aimee?
A.Wave energy increases with distance.
B.Wave energy decreases with distance.
C.Sound waves travel faster in cold air than in warm air.
D.Sound waves travel faster in warm air than in cold air.

Waves is energy transferred through vibrations of electric and magnetic fields. In sound waves, energy is transferred through vibration of air particles or particles of a solid through which the sound travels.

In water waves, energy is transferred through the vibration of the water particles.

The intensity of a sound wave is defined as the amount of energy passing through a unit area of the wave in a unit of time.

Therefore, correct option is B.

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