A Teaching Assistant (TA) earns an average salary of $21,548 per year. A skill in Childhood Education is associated with high pay for this job.
Medical Definition of place theory. : a theory in physiology: the perception of pitch results from the ability of sounds of different pitch to stimulate different areas of the organ of Cortiâcompare telephone theory.
Our perception of sound is directly related to the physical properties of sound waves (see Figure 3.7). One of the ï¬ rst things that we notice about a sound is how loud it is. Loudness is determined by the intensity, or amplitude, of a sound wave and is measured in units called decibels. Zero decibels represents the loudness of the softest sound that humans can hear, or the absolute threshold for hearing. As decibels increase, per-ceived loudness increases. Pitch refers to the relative âhighnessâ or âlownessâ of a sound. Pitch is determined by the frequency of a sound wave. Frequency refers to the rate of vibration, or number of waves per second, and is measured in units called hertz. Hertz simply refers to the num- ber of wave peaks per second.