Tag Archives: Ear

Rechargable Glucose Cells From MIT: Biomedical Research

In what might be called path-breaking in the field of bio-engineering, the Department of Electrical Engineering and Computer Science at MIT is working to cultivate the use of glucose cells and several other innovations which can be used to propel biomedical devices like pacemaker and cochlear implants.

Associate Professor of Electrical Engineering at the Massachusetts Institute of Technology, Rahul Sarpeshkar was at the MIT Technology Review 2012 in Bangalore recently, where he had a discussion on the projects he and his team of PhD scholars have been working on for sometime and have now started yielding results.


Sound is Produced by Vibrations in Matter (Air, Liquids, Solids)

  • Anything which causes matter to vibrate will produce sound
  • Vocal cords vibrate and push on the air flowing through the larynx, causing the air to vibrate
  • Sound cannot travel through a vacuum
  • Sound velocities:
    • Air: 344 meters/sec (770 miles/hr)
    • Water: 1500 meters/sec (3360 miles/hr)
    • Solids: about 5000 meters/sec (11,200 miles/hr)

Pitch is Determined by the Frequency of Vibration

  • We perceive fast vibrations as high pitches, slow vibrations as low pitches
  • When we are young we can hear vibrations from about 20 hertz to about 20,000 hertz