attention deficit disorder
neurosci. A syndrome affecting children, adolescents, and adults characterized by short attention span, hyperactivity, and poor concentration. The symptoms may be mild or severe and are associated with functional deviations […]
audible sound
phys. Human ear can easily detect frequencies between 20 Hz and 20000 Hz. Hence sound waves with frequency ranging from 20 Hz to 20000 Hz is known are audible sound. […]