Final answer:
An object on top of a speaker can vibrate or move when loud music is played due to sound waves. Volume increase leads to more intense vibrations due to stronger wave interference, causing noticeable differences in sound intensity in different parts of a room.
Step-by-step explanation:
When loud music is played through a speaker, an object sitting on top of the speaker might start to vibrate or even jump around due to the sound waves emitted by the speaker. These sound waves cause the air and subsequently the surface of the speaker to vibrate. Loud sounds can produce significant vibrations, especially if the sound frequency resonates with the natural frequency of the object, potentially causing it to move.
In a room with multiple speakers, these sound waves can interact with each other and with the room surfaces, leading to wave interference. This interference can be constructive (where waves add up to make the sound louder) or destructive (where waves cancel each other out, making the sound seem duller). If you increase the volume of a stereo system, the sound wave vibrations will increase, which can be felt by placing your hand on a table next to the speakers, and observed in louder and quieter areas due to this interference.