Which term refers to the energy that causes a wave to form?

• A. Restoring Force
• B. Driving Pressure
• C. Disturbing Force
• D. Energy Source

Answer: (C)

The energy that causes a wave to form comes from the disturbing force that initiates displacement in the medium. When something external pushes or shakes the medium, it moves away from equilibrium and that disturbance sets the wave in motion, transferring energy through the system. The restoring force, on the other hand, acts to pull the medium back toward equilibrium after it’s displaced, shaping how the wave oscillates but not initiating it. Driving pressure and energy source describe broader ideas about what supplies energy, but they don’t specify the initial force that actually disturbs the medium to create the wave. So, the term that best captures the cause of wave formation is the disturbing force.