Question 20N.3.SL.TZ0.b
| Date | November 2020 | Marks available | [Maximum mark: 1] | Reference code | 20N.3.SL.TZ0.b |
| Level | SL | Paper | 3 | Time zone | TZ0 |
| Command term | Suggest | Question number | b | Adapted from | N/A |
The hearing threshold is how loud a sound needs to be before an individual can perceive the sound. The chart shows the mean value of the hearing threshold for hearing-impaired individuals before and after receiving a cochlear implant. Normal human speech has a range of loudness of from 50 to 60 decibels (dB).
[Source: This article was published in Brazilian Journal of Otorhinolaryngology, Volume number
81, issue 2, Caixeta Guimarães, A., Machado de Carvalho, G., Duarte, A.S.M., Bianchini, W.A., Bravo Sarasty, A.,
di Gregorio, M.F., Zernotti, M.E., Sartorato, E.L., Menino Castilho, A., Hearing preservation and cochlear implants
according to inner ear approach: multicentric evaluation., pp.190–196 , Copyright Elsevier (2015).]
Suggest, with reference to the structure of the ear, a reason that a cochlear implant requires an amplifier.
[1]
the implant is not connected to the bones (whose function is to amplify sound)
OR
the implant bypasses the middle ear
OR
the amplifier replaces the function of the bones
The need for an amplifier as the bones of the middle ear were bypassed was noted by the stronger candidates.
