Which of the following produces sound energy?

Sound energy is produced by vibrating objects. When an object vibrates, it creates waves in the surrounding medium (such as air, water, or solid materials). These vibrations disturb the molecules in the medium, causing them to move back and forth. This movement is what generates sound waves, which can then be detected by our ears as sound.

For instance, a guitar string, when plucked, vibrates and produces sound because it causes the surrounding air molecules to vibrate as well. Other examples of vibrating objects include tuning forks, drums, and vocal cords.

Options such as a still object will not produce sound energy since it is not in motion and therefore does not create any vibrations. A light source produces light energy rather than sound energy, and while an electrical circuit can create sound (for example, through a speaker), it is the vibrating components within that circuit that actually generate the sound. Thus, the best answer is a vibrating object, as it is the fundamental source of sound energy.