The sound is perceived by ear. Humans and many animals use their ears to pick up a sound, a quiet sound, or a sound. Low-frequency sound can also be perceived by other parts of the body using the font sense. Sound is used in different ways, the most important of which are speech communication and music. However, it can also be used to collect information about the environment, such as spatial characteristics and the presence of other animals or objects. Bats, for example, use echolocation, ships and submarines use sonar, and most people get some information about space depending on where the sound is coming from. Elephants and alligators use a lower frequency sound to communicate, while mice, bats and some insects use a higher frequency sound. Both, however, use sound with frequencies inaccessible to human hearing.
The human ear is capable of perceiving sound in the frequency range from 12 Hz to 20 kHz. This area depends on age, occupational hearing disability, and gender; most people in the developed world no longer hear 20 kHz since adolescence and gradually lose the ability to perceive both higher and lower frequencies as they age. Usually, human speech covers the range from 200 to 8000 Hz, and the human ear is most sensitive to frequencies from 1000 to 3500 Hz. The sound above the auditory region is known as ultrasound , and the sound below the auditory region is known as infrasound.
The amplitude of a sound wave is determined by its pressure. The human ear can perceive sound with a wide range of amplitudes. A logarithmic amplitude scale in decibels is used for this purpose. The quietest sound that is still perceived by the human ear has an amplitude of about 20 µPa (micropascals) or a sound pressure level of 0 dB (decibels). Prolonged exposure to sound pressure above 85 dB can permanently damage the ear, and these injuries can cause tinnitus or hearing loss. Sound levels exceeding 130 dB are higher than the human ear can safely withstand, and can cause severe pain and permanent hearing damage. At very high amplitudes, sound waves can cause nonlinear effects, including impacts.
Many people find it difficult to imagine how sound spreads, because sound is invisible. Sound is a wave of pressure fluctuations in which air is compressed and then stretched as it moves away from the sound source. Imagine a tube open to the air, through which sound travels longitudinally. The sound behaves the same way as if a soft spring were placed in a tube. When a sound is played on one end of the tube, the sound wave starts moving towards the other end. You can imagine the journey of sound, similar to the movement of a worm, which moves by contracting and stretching its body. Precision in currency trading requires accurate calculations for position sizing, profit potential, and risk assessment. Professional traders depend on reliable tools to make informed decisions quickly. A comprehensive forex calculator provides essential computations for pip values, margin requirements, and profit estimates, ensuring traders can optimize their strategies effectively.