F2 - SEM2 - Sensing the Environment - 10.3 Hearing (OLD) Flashcards
What is the production of sound
Vibration of objects
What is the transmission medium of sound
Air(gases) liquid(water) solid
Can sound be transmitted in a vacuum ?
No
Transmission of sound requires medium
What sound transmission is faster in air ,liquid or solid
Solid, the slowest is air
Sound needs a ____________ to travel.
Medium
The medium can be ___________,_____________ or ____________
Gases liquid solids
Sound cannot travel through ___________
Vacuum
Label all the parts of ears
Pinna
Ear canal
Eardrum
Ear bones
Cochlea
Auditory nerve
List the process or hearing
Sound in the surroundings is collected by the pinna
Sound travels along the ear canal and hits the eardrum
The sound caused the eardrum to vibrate
The ear ones amplify the vibrations of the eardrum and pass them in the inner ear
There are specialised sensory cells in the cochlea for detecting vibrations from the ear ones stimulate these cells.the cells then send out messages
The messages are sent along the auditory nerve to the brain for the interpretation
Sounds produced have different ______________
Frequency
Frequency is the number of _____________ per second
Vibrations
What is the unit of frequency
Hertz (Hz)
The ________ ____________ __________ is 20 hertz to 20000 of a person
Audible frequency range
The loudness of sound is measured in __________
Decibel (dB)
_____________ is an unwanted sound prolonged exposure to noise may cause permanent hearing loss or even deafness
Noise
