The difference between audible and inaudible sounds is their frequency ranges; it is relative to the ability of the human ear to only perceive as audible those sounds that fall within a frequency range between 20 and 20,000 hertz. Other organisms, such as insects, dolphins, dogs and bats, are capable of perceiving sounds that are outside of the frequency range that is audible to humans. Certain species of insects, for example, are capable of perceiving sounds that are four times as high as the upper sound frequency limit of human hearing.Know More
What is perceived as sound is a mechanical wave, or vibration, with the properties of displacement and pressure. Unlike electromagnetic waves, sound waves require a medium to travel through and can not propagate through a vacuum. Solids, liquids and gases all carry sound waves, although the physical properties of a substance affect the speed at which they travel.
What is commonly referred to as "sound" is actually the perception of the kinetic energy of sound waves by the brain. The human auditory organs are unable to react to sound waves above or below what is termed the audible range, which represents sound waves with wavelengths falling within the lower frequency range of about 55.75 feet, and at the upper frequency limit, about two-thirds of an inch. The higher-frequency sounds above the audible limit are referred to as ultrasound.Learn more about Optics & Waves
Generally, the lowest frequency of sound the human ear can hear is 20 Hz. Sounds below this frequency are referred to as infrasound. Some people, however, have extra sensitivity and are capable of detecting sounds as low as 15Hz in the infrasonic range.Full Answer >
In acoustics, the harmonics of a sound all have a higher frequency than the fundamental frequency. The fundamental frequency is the lowest resonant frequency that a sound generator produces.Full Answer >
The frequency of a sound is the rate at which wave crests reach a given point. Sound waves propagate outward from their source, as a series of compressions and rarefactions of the surrounding air. The peak of each cycle can be plotted as the crest of a wave, as can the low point or trough. The frequency with which these crests and troughs arrive gives sound its pitch.Full Answer >
The pitch of a sound is the ear and brain interpreting the frequency of the sound. When there is a high frequency, the ear interprets the sound as a higher pitch, and when the frequency is low, the ear hears a low pitch. Pitch has been standardized and uses "cents" as a unit of measurement.Full Answer >