Video and lesson investigations on the topic of hearing. Key concepts include:
- Loud sounds can damage the hearing ability of ears.
- Ear-defenders protect ears by cutting down the intensity of sound that reaches them.
- Ears are sensitive organs and have limits to the amount of sound they can safely handle. Exceeding these limits can damage the ears, in some cases permanently.
- Ears need to be protected from these risks where sustained and excessive sound is present.
- The longer the exposure to excessive sound the greater the risk of ear damage. The eardrum or tympanic membrane), which vibrates as sound is carried to it, is very thin.
- It is only able to tolerate vibrations to a set limit.
- Sound that is too loud causes the eardrum to vibrate beyond its endurance and can make it rupture.