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2.2 FACTORS AFFECTING PROPAGATION OF SOUND There are several important factors, which affect the propagation of sound: geometric spreading, atmospheric effects, and surface effects. These are discussed separately below. 2.2.1 Geometric Spreading This refers to the spreading of sound energy as a result of the expansion of the wave fronts.
There are two main properties of a regular vibration-the amplitude and the frequency-which affect the way it sounds. Amplitude is the size of the vibration, and this determines how loud the sound is. We have already seen that larger vibrations make a louder sound.Amplitude is important when balancing and controlling the loudness of sounds, such as with the volume control on your CD player.It is also the origin of the word amplifier, a device which increases the amplitude of a waveform. Frequency is the speed of the vibration, and this determines the pitch of the sound.It is only useful or meaningful for musical sounds, where there is a strongly regular waveform.t is also the origin of the word amplifier, a device which increases the amplitude of a waveform. Frequency is the speed of the vibration, and this determines the pitch of the sound. It is only useful or meaningful for musical sounds, where there is a strongly regular waveform.