Energy remains constant is the answer you are looking for but it only applies, when no outside forces act on the object.
Answer:Theoretical Discussion
The diffraction of classical waves refers to the phenomenon wherein the waves encounter an obstacle that fragments the wave into components that interfere with one another. Interference simply means that the wave fronts add together to make a new wave which can be significantly different than the original wave. For example, a pair of sine waves having the same amplitude, but being 180◦ out of phase will sum to zero, since everywhere one is positive, the other is negative by an equal amount.
I would say Lava.
Hope this helps. :)
Answer:
Different
Explanation:
The hollow one will expand even more making it have a larger volume then the solid one so they are different
A battery powering a flashlight is the correct answer