Hearing

Frequency: the number of complete wavelengths that pass through a point at a given time. This determines the pitch of a sound

Amplitude: how loud the sound is. The higher the crest if the wave is the louder the sound is. it is measured in decibels

Helmholtz place theory: we hear different pitches because different sound waves trigger activity at different places among the cochlea's basilar membrane

Frequency theory: we sense pitch by the basilar membrane vibrating at the same rate as the sound

Conduction hearing loss: caused by damage to mechanical system of ear

Sensorineural hearing loss: caused by damage to cochlea's receptor cells or to auditory nerves