What sounds can I hear?
Sound is measured in decibels (dB).You can hear sounds ranging from a low rumble up to a high-pitched whistle. The lowest sounds can sometimes be felt in the chest, while very shrill sounds may be so high that you cannot hear them. A bat’s squeak is at the limit of what humans can hear, and many people cannot hear this noise at all. Human hearing is not very sensitive compared to animals such as dogs who can hear very high-pitched sounds. Dogs are able to respond to a supersonic whistle that cannot be heard at all by humans.
How do my ears tell me where I am?
The ears contain the organs of balance. These are three curved, liquid-filled tubes that are attached to the cochlea. The tubes, called semicircular canals, contain tiny grains of chalky material. As you move and turn your head, the liquid swirls though the tubes, carrying the particles with it. The chalky grains trigger sensory cells that produce nerve impulses. These impulses are then passed to the brain, telling it the exact position of your head at any time.
What is perfect pitch?
Most people have perfectly adequate hearing, but a few people have exceptional hearing abilities. People who can identify and remember a sound exactly are said to have perfect pitch. They are usually able to sing or play any musical note without being prompted.
Why do my ears pop?
When you go up in a lift or fly in a plane, your ears may pop as the air inside them expands. If this did not happen, your eardrum would burst as the air trapped inside your ear expands with the lower pressure. As the air expands, it leaks out through the Eustachian tube, which leads to your throat. It is this change in pressures that causes the popping sound.
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