sound
#1 - Longitudinal waves
#2 - All sounds come from the vibration of material objects.
#3 - All sound waves need a solid, liquid, or gas as a medium.
#4 - Resonance is when the frequency of a vibration forced on an object matches the object's natural frequency, causing an increase in amplitude. An example would be two tuning forks set at the same frequency. When you tap one, resonance occurs for the other. It "pushes" the sound. This push increases the amplitude. As the pattern continues, the amplitude continues to increase.
#2 - All sounds come from the vibration of material objects.
#3 - All sound waves need a solid, liquid, or gas as a medium.
#4 - Resonance is when the frequency of a vibration forced on an object matches the object's natural frequency, causing an increase in amplitude. An example would be two tuning forks set at the same frequency. When you tap one, resonance occurs for the other. It "pushes" the sound. This push increases the amplitude. As the pattern continues, the amplitude continues to increase.