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12.4 Bats and Echoes
The ear's sensitivity is close to the limit at which it would begin to detect noise in the air.
The displacement of the power at the threshold of hearing is less than the size of the molecule itself.
The sound pressure is amplified by the mechanical construction of the ear.
The middle ear makes most of the amplification.
The eardrum is 30 times larger than the window.
The ossicles act as a lever with a mechanical advantage.
There is an increase in the pressure at the eardrum due to the resonance of the ear canal.
The pressure is increased by 2 in this range.
The mechanical amplification of the sound pressure in the 3000-Hz range is about 2 x 30 x 2 120.
The intensity is proportional to pressure squared.
The intensity at the window is amplified by a factor.
The ear cannot fully explain the process of hearing.
Our perception of sound is influenced by the brain.
The brain can be used to separate meaningful sounds from a loud background din.
Sounds that appear meaningless can be completely suppressed by the brain.
Even though the sound is still vibrating in our ear, we may not be aware of it.
The mechanism of interaction between the brain and sensory organs is not fully understood.
There are animals that can hear better than us.
Bats are notable among these animals.
They use sound waves and sound waves reflected from surrounding objects.
Their sense of hearing is so bad that they can get information from echoes that are much more detailed than what we can see.
The bats use echoes in many ways.
The chirps start at a Frequency of 100 x 103 and end at a Frequency of 30 x 103.
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