What is the critical magnetic field for lead at T = 2.8 K.
Unit Two Notes The human ear is a highly sensitive sound receptor o Pressure fluctuations in the outer ear are transformed into vibrations of small bones (the ossicles) in the middle ear. o The ossicles are ultimately communicated to the cochlea in the inner ear o From there, the vibrations are further transformed by stereocilla (hair cells) into neural impulses distributed by frequency o Humans are capable of detecting pressure variations of less than 1 billionth of an -9 atmosphere (<10 atm) Threshold of hearing o When the pressure is increases from threshold pressure by a factor of about I trillion (10 ), the sound becomes painful to the ear Threshold of pain This huge 10 dynamic range is converted into a logarithmic scale producing a more user-friendly scale. This allows users to clearly visualize huge changes in sound intensity. Anatomy of the Ear o The structures of the outer and middle ear contribute to both the remarkable sensitivity and the wide dynamic range of human hearing o They can be considered to be both a pre-amplifier and a limiter for the human hearing process Outer Ear Gathers and focuses incoming sound on tympanic membrane Amplifies frequencies important to human speech (2 kHz-5 kHz) Convers pressure fluctuations to d