Schumann resonance is a natural electromagnetic frequency generated by the Earth's magnetic field, which is created by the reflection of electromagnetic waves between the Earth's surface and the ionosphere, forming the semblance of a spherical waveguide that maintains the equilibrium of the electromagnetic midst of planet Earth.
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Resonance is a phenomenon that occurs when an object or system is subjected to an external force or vibration whose frequency matches a resonant frequency (or resonance frequency) of the system, defined as a frequency that generates a maximum amplitude response in the system.
Resonance, in physics, relatively large selective response of an object or a system that vibrates in step or phase, with an externally applied oscillatory force.
Resonance is the physical phenomenon in which a system vibrates in response to an applied frequency, but the external force of this frequency interacts with the object in such a way that it causes the system to oscillate with a maximum amplitude due to the specific frequency induced.
Now that you understand the key points about the definition of resonance and what a resonance frequency is, you can understand the classic example of a singer managing to break a crystal glass by singing at the right pitch.
Many of the finest musical instruments possess a high degree of resonance which, by producing additional vibrations and echoes of the original sound, enriches and amplifies it.
Resonance in sound occurs when an object or air column vibrates at its natural frequency due to a matching sound frequency, resulting in loud, amplified sound. This is seen in tuning forks and musical instruments.