Two observation points are located at distances r₁ and r₂ from a source of sound. The sound spreads out uniformly from the source, and there are no reflecting surfaces in the environment. The sound intensity level at distance r₂ is 6 dB less than the level at distance r₁.
a. What is the ratio I₂/I₁ of the sound intensities at the two distances?
b. What is the ratio r₂/r₁ of the distances?

1= 26.17

2= 1.17

3=30.86

4=5.86

just took the assigment on edge

layers of the earth affect the waves and these effects are seen on instruiments such as seimometers

the box does not move because you need to use a force greater than 300 n. you are only using 50 n. it needs to at least be 301 n for the box to move because then it is an unbalanced force and it will move the way that the greater force is pushing it. if you use only 300 n it will be a balanced force and will not move because the force you are exerting on the   box is the same as its force.

hope this !

im sorry if i went too in depth, i am going to include a link to a video on khan academy that will explain this.   hope that you like the video and that it explains more in detail to you.

that is the link.