The energy applied to cause vibration can be in the form of air pressure, a
stick, a bow, or electricity.

True

Explanation:

Everything present in the universe is made up of energy. These energy vibrate at different frequencies.

Depending on the vibration, the frequency could be regular or irregular.

The air pressure in a bagpipe stick i.e the drumstick on a drum, a bow on a fiddle (violin) and electricity can produce sounds in the fluorescent lights.

Vibration can be caused by one or more factors at any given time, the most common being imbalance, misalignment, wear and looseness. All these can be caused by air, electricity, etc.