I don’t know what the question is asking
Concave is not a type of mechanical wave because it doesn’t need a medium for propagation.
I believe that sugar will desolve the fastest because of the room temperature
Answer:

Explanation:
Given that,
The distance between the centers of the two oxygen atoms in an oxygen molecule is
.
We need to convert this distance in inches.
We know that,
1 cm = 0.393 inches
We can solve it as follows :

So, the distance between the centers of the two oxygen atoms is
.