Overtones
Frequencies which are multiples of a certain frequency
If f is a given frequency, 2f is its first overtone
Loudness
The greater the amplitude the greater the loudness
Pitch
The higher the frequency the higher the pitch
Quality
The quality of a musical note depends on the number of overtones present in the note and the relative strengths of the different overtones present
Frequency limits of audibility
The highest and lower frequencies that can be heard by a normal human ear
Resonance
If the frequency of a periodic force applied to a body is the same as or very near to its natural frequency that body will vibrate with very large amplitude
Infrasonic
Sound waves with frequency lower than 20Hz
Ultrasonic
Sound waves with frequency above 20 000Hz
Sound intensity of a point
The rate at which sound energy is passing through unit area at right angles to the direction in which the sound is travelling at that point
Threshold of hearing
Smallest sound intensity detectable by the average human ear at a frequency of 1kHz
Beats
Periodic variation in the loudness of a sound
Fundamental frequency of a string
A string vibrating with an antinode at its centre and a node at each end
Harmonics
Frequencies which are multiples of a certain frequency