Nico vibrates an object at different frequencies. At a certain frequency, the sound gets louder and then returns to the same volume when he moves to the next frequency. What is occurring when the sound gets louder?

as technology advances, new experiments often expose problems in accepted theories. c

hope i

-lavira: )

the entire statement is true and correct.  

there's no diagram, nothing is illustrated, and no question is asked.

what is the actual question though?