Resonance

Resonance, An object free to vibrate tends to do so at a specific rate called the object's natural, or resonant, frequency. (This frequency depends on the size, shape, and composition of the object.) Such an object will vibrate strongly when it is subjected to vibrations or regular impulses at a frequency equal to or very close to its natural frequency. This phenomenon is called resonance. Through resonance, a comparatively weak vibration in one object can cause a strong vibration in another. By analogy, the term resonance is also used to describe the phenomenon by which an oscillating electric current is strengthened by an electric signal of a specific frequency.

PHYSICS BEHIND IT

Resonance is caused when an object is oscillated and its exerting waves reach an object with the same natural frequency as the oscillated object, once in contact the object reached by this waves performs the same motion as the object exerting the waves, in Physics, this is called resonance.