Sonic sci­ence

How It Works - - SPECIAL -

A screw­driver, pen, lip­stick and gun – sonic tech­nol­ogy has al­ways been in the firm grip of the Doc­tor, her friends and en­e­mies. At the press of a but­ton, the Doc­tor can dis­arm a Sil­urian solider, sever a sus­pended rope and crack any lock… as long as it’s not made of wood. The power of the sonic screw­driver is not merely the prod­uct of me­chan­i­cal make-be­lieve but fol­lows the logic of high-ki­netic sonic waves. The phys­i­cal abil­i­ties of sonic tech­nol­ogy can be demon­strated in acous­tic lev­i­ta­tion. Us­ing a sound-emit­ting trans­ducer, sound waves are sent up­wards to an over­hang­ing re­flec­tor, which re­flects the waves back down. At a spe­cific wave­length this sound pres­sure can hold an ob­ject in its grasp and ap­pear to make it lev­i­tate. How­ever, these sound waves can do much more than hold a ball in mid-air.

Sound waves, such as ul­tra­sound, can be used to see in­side the body, used at high fre­quen­cies to vi­brate the dirt away when clean­ing tanks, while in­fra­sound can even be weaponised to af­fect hear­ing, bal­ance and in­duce headaches.

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