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up vote 1 down vote favorite. 1. The intensity of a wave is proportional to the square of the amplitude of the AND the frequency of the wave given by the equation: Now when talking about sound waves the sound level of a noise (loudness), it is proportional to the intensity of the source.
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. Frequency is measured as the number of wave cycles that occur in one second.here 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.