front 1 Overtones | back 1 Frequencies which are multiples of a certain frequency If f is a given frequency, 2f is its first overtone |
front 2 Loudness | back 2 The greater the amplitude the greater the loudness |
front 3 Pitch | back 3 The higher the frequency the higher the pitch |
front 4 Quality | back 4 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 |
front 5 Frequency limits of audibility | back 5 The highest and lower frequencies that can be heard by a normal human ear |
front 6 Resonance | back 6 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 |
front 7 Infrasonic | back 7 Sound waves with frequency lower than 20Hz |
front 8 Ultrasonic | back 8 Sound waves with frequency above 20 000Hz |
front 9 Sound intensity of a point | back 9 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 |
front 10 Threshold of hearing | back 10 Smallest sound intensity detectable by the average human ear at a frequency of 1kHz |
front 11 Beats | back 11 Periodic variation in the loudness of a sound |
front 12 Fundamental frequency of a string | back 12 A string vibrating with an antinode at its centre and a node at each end |
front 13 Harmonics | back 13 Frequencies which are multiples of a certain frequency |