Yes, yes, the speed has changed, because the speed of sound is different in different media, and the frequency is determined after your sound is emitted and will not change.
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Acoustics is one of the branches of physics. It is a science that studies the generation, propagation, reception and effects of mechanical waves in media. The medium includes various states of matter (solid, liquid, gas, etc.), which can be elastic or inelastic media. Mechanical waves refer to the propagation phenomenon of changes in particle motion (including changes in one or more of displacement, velocity, and acceleration). Sound waves are a type of mechanical waves.
Hearing
The hearing process involves physiological acoustics and psychoacoustics. It can quantitatively represent the subjective quantity of sound produced in the human ear (pitch and loudness), and obtain the functional relationship with physical quantities (frequency and intensity). This is a major achievement in psychophysical research. Audiometry and eardrum acoustic impedance measurement techniques were also established, which are effective tools for studying middle and inner ear pathologies. In auditory research, the equipment used is simple, but the results obtained are surprisingly rich. In 1961, physicist G. von Bachey won the Nobel Prize in Medicine or Physiology for his research work on hearing. This is an example of physicists' work in marginal disciplines being recognized. Mainly because the exact activities and mechanisms of the nervous system and brain are unclear, a complete theory of hearing has not yet been formed. However, this aspect has attracted the attention of many acoustic workers, and great achievements have been made since the 1950s. Through a large number of physiological and psychophysical experiments, we can draw several conclusions and put forward some assumptions: after the sound reaches the human ear, the ear converts it into mechanical vibration, which is amplified by the middle ear and then reaches the inner ear, causing the basilar membrane in the cochlear duct to *** Vibrate. The sensing units are the inner and outer rows of hair cells on the basilar membrane. The outer hair cells are basically a row of chemical amplifiers that transmit vibrations to the inner hair cells, stimulating their bending vibration. When the vibration reaches a certain threshold, the nerve endings in contact with the inner hair cells send out electrical pulses, sending signals through the nervous system. brain. The nerve nuclei connected to the inner hair cells mainly respond to the vibration speed of the basilar membrane, while the outer hair cells respond to the displacement of the basilar membrane. Nerve signals are electrical pulses of tens of millivolts, and the pulse duration is about tens of milliseconds. The signal is sent to the brain through nerve impulses. Figure 4 is an imaginary flow chart. From the brain, the signal is then distributed to various centers in the cerebral cortex for storage, analysis, integration or discarding. This is a preliminary understanding. To establish a complete auditory theory and explain all auditory phenomena, a lot of work still needs to be done, which involves the study of brain function.
In the area of ??speech and hearing, basic research has led to the production of many important medical devices: hearing aids that fit entirely into the auditory canal; earplugs for hearing protection, artificial larynxes for patients with vocal cord damage, speech synthesizers , tactile sensors and cochlear implants for completely deaf patients, etc.
Speed
Generally speaking, solid transmission is faster than water transmission, and water transmission is faster than air transmission.