Simple Harmonic Motion Concept Page - 14

Definition
Resonance Definition
Resonance is the tendency of a system to oscillate with greater amplitude at some frequencies than at others. Frequencies at which the response amplitude is a relative maximum are known as the system's resonant frequencies, or resonance frequencies.
Definition
Resonance
The resonance is a special case of forced vibrations. The frequency and phase of driving force is same as that of the free vibrations. Amplitude of the vibrations keep increasing in magnitude continuously. 
Example
Examples of resonance
Examples of resonance are sympathetic vibrations of pendulums, machine parts, instruments, air column and tuning fork, oscillations of bridge, etc.
Definition
Describe the applications of resonance
The applications of resonance are as follows:
  • Hearing occurs when the ear drum (typanic membrane) resonates to sound waves hitting it. 
  • Microphones and the diaphragm in the telephone works in much the same way. 
  • Speakers in hi-fi's, T.V's etc. use resonance as well. 
  • Resonance is used in guitars and pianos, as well as wood wind instruements. 
  • Resonanse is also used to shatter gall stones in patients using ultra sound.
  • MRI scans (Magnetic Resonance Imaging scans) are used everyday in hospitals for diagnostic purposes and also for industrial purposes.

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