Chapter 11 Flashcards
What is sound?
Sound is a form of energy that travels by longitudinal mechanical waves
What is natural frequency?
Natural frequency is the frequency that a body oscillates at when vibrating freely
What is resonance?
Resonance is the transfer of energy due to a periodic force between two bodies (two systems) if similar natural frequencies so that a body vibrates at its natural frequency
What is a stationary wave?
A stationary wave is a wave that remains in a constant position; it is made up of a series of nodes and antinodes
What is a node?
A node is a point where there is no vibration
What is an antinode
An antinode is a point where there is maximum vibration
What is the fundamental frequency?
Fundamental frequency is the lowest natural frequency of a vibrating object
What are harmonics?
Harmonica are multiples of the fundamental frequency
What is quality?
The quality of a note describes the shape of the sound wave; it depends on the number and amplitude of the harmonics present
What is sound intensity?
Sound intensity is the rate at which sound energy passes through unit area at right angles to the direction of the propagation of the wave
What is the threshold of hearing?
The threshold of hearing (1x1012 W m-2) is the smallest sound intensity detectable by the average human ear at a frequency of 1 kHz
What is sound intensity level?
The sound intensity level is a scale that compares a particular sound intensity to the threshold of hearing
What is the decibel adapted scale?
The decibel adapted scale, dB(A), is a sound intensity level scale that has been adapted for the ear’s frequency response
