![]() ![]() This rhythmic motion is then transmitted via nerve signals to the brain, where it is interpreted as sound.įrom the external ear to the cochlea, the sound waves travel in the form of tiny motions of molecules. Normally, sound waves transmitted in air spiral through the ridges of your outer ear, bounce around in your ear canal, vibrate your eardrum, wiggle the tiny bones of your middle ear, and finally set the fluid in the cochlea, in your inner ear, in rhythmic motion. The nerve impulses sent by the cochlea along the auditory nerve to your brain are then interpreted as sound, just as if they had been caused by sound waves entering your ear. In turn, the vibrations stimulate the nerve endings in your cochlea, which is part of your inner ear. When you bite on the motor, these vibrations are transmitted to your teeth and jaw bone. The interaction of these constantly changing electromagnetic fields with the permanent magnets in the motor causes the motor to vibrate. ![]() Since the electric current is constantly changing, the strength of the electromagnetic fields constantly changes too, in synchronization with the radio output. When the electric current passes through the coils of the motor, these coils act as electromagnets. The output from the radio, in the form of a changing electric current, is sent through the audio cable to the motor. If you have earbuds, you can try biting on those (after wrapping them in plastic) instead of using a motor.Do some work better than others? Do you hear some frequencies more clearly? Try different types of songs or other sounds.Try pressing the motor directly against other bones in your head.Which position produces the clearest sound? Try pressing the motor against your skull behind your ear, then hold the motor against your forehead.Mobile phones and MP3 players also work, but can be harder to hear and there is a small risk of damaging your device if you spin the motor shaft rapidly. ![]() If necessary, try other boom boxes or radios until you find one that works older radios are likely to work better. Note: Some radios have a weak headphone output, so they may not work with this Snack. You can also try biting on the shaft of the motor instead of the case. If you have trouble hearing the radio, try plugging your ears with your fingers to drown out any competing external noise. You should hear the radio playing! You may have to listen very carefully. Set the radio volume to a medium-high level, then put the plastic-covered motor in your mouth and bite down on the metal case. ![]()
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