Which of the following describes what a hearing aid does?
amplifies sound waves
reproduces nerve-cell function
transmits electrical signals to the brain
emits electrical signals to the auditory nerve
'A hearing aid is a small electronic device that you wear in or behind your ear. It makes some sounds louder so that a person with hearing loss can listen, communicate, and participate more fully in daily activities. A hearing aid can help people hear more in both quiet and noisy situations.'
