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Screensize: 640 x 480 800 x 600 1024 x 768 1280 x 1024 UserName: Password: Format Mode: Basic  Help  Prompt  Format: Font Andale Mono Arial Arial Black Book Antiqua Century Gothic Comic Sans MS Courier New Georgia Impact Lucida Console Script MT Bold Stencil Tahoma Times New Roman Trebuchet MS Verdana   Size 1 2 3 4 5 6   Color Black Red Yellow Pink Green Orange Purple Blue Beige Brown Teal Navy Maroon LimeGreen Message: * HTML is OFF * Forum Code is ON Smilies [quote][i]Originally posted by boron[/i] [br]I understand how an MRI works. However when I was lookin up why it makes noise I found this: "The technique of MR imaging employs magnetic fields called gradient fields that are used to determine the location of signals generated in the MRI process. These powerful gradient fields are switched off and on at a very fast rate and the result is a banging sound." Why does a field being turned on and off make noise? Is it the circuit being used to turn them on and off like the clicking of a relay? Or is it caused by some weird phenomena of the gradient field? While were on the subject of fields, I understand according to quantum theory why objects can have magentic properties, due to the spin (paired or unpaired) of electrons, protons and neutrons. I also understand that radio waves and other forms of electromagnetic radiation photons can be emmited from exited electrons as they jump orbitals. However what I don't get is how electronic circuits (such as transmitters) are capable of producing radio waves, microwaves, etc. How is an electric current capable of energizing more electrons to "jump" and force them to produce the radiation? Any insight would be great. Thanks [/quote]    Insert an Image File (GIF, JPG, JPEG, BMP, ZIP, PNG) Check here to include your profile signature.