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Given a fundamental frequency of 300 Hz, what is the third harmonic?
900Hz
300 × 3 = 900 Hz
Resonance
a forced vibration that occurs at an object’s natural or resonant frequencies, increasing the amount of energy
vibrating objects (like guitar strings) resonate at the fundamental frequencies and its harmonics
The amplitude of vibration at the resonant frequency…
increases significantly because energy is efficiently transferred to the system at that frequency
A band pass filter…
passes frequencies that fall only within a relatively narrow range
A band reject filter…
passes all frequencies except those that fall within a relatively narrow range
A low-pass filter…
allows lower frequencies to pass through the filter
A high-pass filter…
allows higher frequencies to pass through the filters
Filters in real life
hearing aids
hearing protection
sound level meters
your car (turning up the base, etc…)
Note 
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