Properties of sound

There are three properties of sound. 

As sound travels it get weaker. 

 I know that because the meter went lower every time I stood back and clapped         

Sound travels the same in every direction. 

I know that because Mr Wong metered one meter above and one meter to the left and they were basically the same.

Sound can travel round corner.

I know that because Mr Wong went behind a wall and clapped his hand while his computer was on the other side of the wall and still measured a sound.

Observation I think...	Evidence	Hypothesis
Sound is louder when it's closer to the source and quiet when far.	Mr Wong meter was 80 and Mr Ogilvie was 59	As sound travels it get weaker
The sound was basically the same in different position around the source	The meter recorded basically the same sound in the back front right left	Sound travels the same in the every direction
Sound was recorded around a corner from the source	The meter went high when Mr Wong went round the wall and clap his hand	Sound can travel round corner