Question

which of these objects would most likely cause a sound wave?

• a still lying on its side
• a nail stuck into a piece of wood
• a hammer hitting a metal cup
• a wrench locked in place around a nut

Explanation:

Sound waves are produced by vibrations. A nail being struck into a piece of wood creates vibrations as the nail deforms the wood and the impact causes movement and shaking. A still - lying object, a hand holding a cup without movement, and a watch locked in place do not produce vibrations that would generate sound waves easily.

Answer:

a nail struck into a piece of wood