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Sound Transmission. 
As you have discovered in Lesson 1 sound waves travel in londitudinal waves. 
What happens when sound travels through a solid or a gas? 
How would this change how the sound travels? 
Solid. 
In a solid the particles are close together. The vibration passes from one particle to the next easily. 
A sound wave therefore travels quickly through solids. 
Gas. 
In a gas the particles are further apart. the vibration passes from one particle to the next less easily.
A sound wave therefore travels slowly through gas.

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