Waves - Sound and Water

1. Which property of sound would you change to make a sound wave sound louder?
    
    
    
    
    
    
2. Draw a sound wave on the diagram that has the same pitch but is louder.
   
    
3. Which property of sound would you change to make a sound wave have a lower pitch?
    
    
    
    
    
    
4. Draw a sound wave on the diagram to the right that has a lower pitch but the same volume.