how does blue tooth work what are the kind of rays the device using it sends?
91704
Bluetooth uses digital radio wave similar to WiFi
745636
The main concept to understand is that of a carrier wave.  The radio wave is that.  A radio wave is electro-magnetic radiation, which, unlike other waves, is not a vibration within a medium, like sound waves for example, which are the propagation of alternating high and low pressure within the air, or other fluid media.  Electro-magnetic waves are a self propagating electro-magnetic effect which can travel even in a vacuum.  Electro-magnetic radiation is a pulsing stream of energy where the pulses are at a constant frequency.  What we perceive as different phenomenon are in fact the same electromagnetic radiation but at different frequencies.  Microwaves, Radio, Ultra-violet, Visible Light, and Infra-red, are all electro-magnetic radiation moving down the scale from high to low frequency.\n\nThe radio transmitter sends out radio waves at a specific frequency or band of frequencies.  The aerial of the receiver develops tiny electric currents in it as the radio wave flows past it.  These are pulsing currents at the same frequency as the radio wave, but these pulses are not in themselves the content of speech or music.  This content, or signal, is carried in the wave, hence the concept of the carrier wave.\n\nIt is easier to understand Amplitude Modulation or AM radio so I will restrict myself to that.  If you imagine a radio wave as a very long string with the pulses like beads on it, all spaced at precise intervals, then imagine that the beads slowly getter bigger and smaller along its length.  Each bead is a packet of energy in the wave and all occur at the same frequency, but where the beads get bigger there is more energy in the packet.  It only takes a little more imagination now to see how the pattern of a sound wave can be represented by the bulging out of the beads, and their getting smaller.  This is called the amplitude.\n\nLooking at it in practical terms, at the transmitter end sound is converted in the microphone into a corresponding pattern of changes in the current flowing through the microphone.  That is your signal.  That signal which is at a low electrical power, is used to create the same pattern but in a circuit of much higher electrical power - that is what an amplifier does.  The device used to transfer the pattern is called a transistor, which uses the low powered circuit to control the flow in the high powered circuit.\n\nThe amplified signal is fed to the transmitter aerial, so now that pattern of electrical energy, identical to the pattern of the sound picked up by the microphone, comes out of the aerial as radio waves, with the pattern held in the varying amplitude of the radio wave.\n\nNow comes a trick to follow.  If there are thousands of transmitters all radiating radio waves all over the place, how come your radio only picks up the one signal.  This is where the tuner comes in.  The principle of radio tuning depends on the opposite properties of coils and capacitors.  I don't know if you know what these are, but it doesn't matter if you don't.  Both of these devices have a special kind of resistance to electricity known as impedance.  Impedance only operates where the current is varying.  The voltages and currents in our radio Ariel will be varying at exactly the same frequency as each radio wave it is exposed to, so if we pass that current through either a coil or a capacitor there will be an impedance in the circuit.  Now the impedance of the coil increases as the frequency gets higher and the impedance of the capacitor gets higher as the frequency gets lower.  An AM tuning circuit simply passes the signal current through both a coil and a capacitor at the same time, and the capacitor is a mechanically variable one, so by turning a knob you can increase or decrease the capacitance.  The trick here is that as the capacitance changes the circuit will show least impedance to a specific frequency compared with all the others, so provided the frequencies are not too close, as the law requ
761790
Your transmitter will work, your receiver won't.\nbut you could bounce the signal onto a simple solar cell\nconnected to a set of headphones and you should be\nable to receive a weak signal...\nYour receiver won't work because light won't move the paper and the grains of sand.....
474846
What colour will what be?\n\nLight is additive: red light plus green light will yield whitish light.  The blue object will still look blue.\n\nIf you mean that the light passes through the blue object onto the screen, all non-blue light will be filtered out, so the spot on the screen will look blue.
213370
What Arab Blue Tooth?\n\nHow do you expect an answer when your question is not properly phrased?\n\nThank you and good luck finding your Blue tooth.
59960
Bluetooth is a technology that uses radio frequencies and infrared is a type of non visible  radiation that when applied to  computer communications task was called  IrDA.  Both IrDA and Bluetooth have similar technological objectives in providing solutions for wireless short range control and communications with computers, telephones, and other consumer devices.\n\n\nBoth technologies use radiation present in the electromagnetic spectrum at extremely low power levels to maintain their objectives of "short" range communications. The electromagnetic spectrum encompasses the entire range of ionizing and non-ionizing radiation extending in frequency from approximately 1023 hertz to 0 hertz, or in corresponding wavelengths, from 10-13 centimeter to infinity. This spectrum includes all forms of classical non-ionizing radiation we are familiar with including ultraviolet light, visible light, infrared (light) radiation, microwaves, and radio waves.  The spectrum also includes ionizing radiation such as cosmic-ray photons, gamma rays, x-rays. \n\nIt is well known that ionizing radiation such as cosmic-ray photons, gamma rays, x-rays even at low levels can cause damage to living organisms and such damage is bio-accumulative. \n\nThe effects of non-ionizing radiation such as ultraviolet light, visible light, infrared (light) radiation, microwaves, and radio waves also has known affects on living organisms.  For instance it is ultraviolet light from the sun that gives us both sun tans and a hazard from skin cancer.  Non-visible infrared from a fireplace can be comforting when it is cold outside.  We use microwaves to cook all kinds of food. \n\n\nThere appears to be no short term hazards in using  Bluetooth and Cellular phones.  However the question you pose has been the subject of global debate.  \n\nIt may seem obvious  but LONG TERM empirical  studies  of LOW LEVEL exposure to anything requires the passage of real time.       Such studies and experiments run concurrent  with the potential exposure of millions of people that may be using such technologies while they are being studied.    \n\nThe effects of using tobacco is a great example of a consumer product that was widely used, sold, and promoted without having information on the hazards.  Huge litigation settlements in this country suggest that much was known about the hazards of tobacco but this information was concealed from the public.
163921
I believe bluetooth uses 2.4 GHz, but I could be wrong about that.\n\nBasically the modern wireless standards and cellphones use frequencies which are not ionizing. Higher frequencies, with more energy, can zap the electrons off atoms and that can cause medical problems. Non-ionizing radiation just sort of wiggles the atoms around. (These are technical terms of course...)\n\nWhat confuses people sometimes is that the 2.4 GHz is also the frequency for a microwave oven. But a microwave has a very powerful radio source inside so it wiggles the atoms in your pot roast, or whatever, a lot, in order to heat them.\n\nBluetooth being so short range is even weaker, I believe, than a typical cellphone. \n\nYou're not going to heat you brain with a cell phone. So the chance of any danger is extremely slight. (Of course that danger also depends on how much you use the phone.)
1041538
You can send it using USB Bluetooth Dongle. But It only works for 15 Meter range!
648006
Its said that cell phones.. When you're blabbing away on your cell phone, did you know that your voice is transmitted from the antenna as radio frequency radiation? In fact, your voice puts out about half as much radiation as a microwave. Too bad we can't cook up a meal simply by talking to it on our cell phone.\n\nIt shouldn't come as a surprise that with that much radiation flowing from your phone, there's a good chance it's going to soak into your brain and cause some kind of damage. Cell phone users are at risk for getting rare brain tumors. In fact, studies have found that the rare tumors happen on the same side of the head that people usually use to talk on their cell phones.\n\nMillions of people use their cell phone on a daily basis - America alone has about 123 million cell phone users. Are you one of them? If so, you are putting a high-powered transmitter against your head - about an inch away from your brain. So don't sound so shocked to hear that talking on your cell phone might cause some serious damage.
361250
Well, the ear is naturally designed to collect, focus, and transmit sounds through a tiny and efficient conveyance system called the auditory pathway.\n\nsee how it works\nhttp://www.fi.edu/fellows/fellow2/apr99/auditorypath.html
1017442
first of all you have to have bluetooth transmitter installed in your PC usually its a hardware piece you plug it on the usb , with this device there is software and an application will help you transfer your files to your mobile and vice versa , some mobile phones has its own software for transfering those files but usually depend on your PC hardware configration .
78654
Oddly enough:\nhttp://www.bluetooth.com/
592137
blue tooth is not dangerous to you .not en-less its a blether shark  Lil
1187473
BLUE-RAY  The new technology
252280
no, I use a bluetooth which works perfectly  fine and dose not give any type of a migraine
32671
Bluetooth is a technical industry standard that facilitates communication between wireless devices such as mobile phones, PDAs (personal digital assistants) and handheld computers, and wireless enabled laptop or desktop computers and peripherals. A single Bluetooth-enabled wireless device is capable of making phone calls, synchronizing data with desktop computers, sending and receiving faxes, and printing documents. For example, an individual can use a Bluetooth connection to print a document from his PDA. \n\nBluetooth devices use a microchip transceiver that operates on the 2.45GHz frequency and have a range of up to 10 meters (approximately 33 feet).
1141539
BlueTooth is a specification for the use of low-power radio communications to wirelessly link phones, computers and other network devices over short distances. The name "Bluetooth" is borrowed from Harald Bluetooth, a king in Denmark more than 1,000 years ago. \nBluetooth technology was designed primarily to support simple wireless networking of personal consumer devices and peripherals, including cell phones, PDAs, and wireless headsets. Wireless signals transmitted with Bluetooth cover short distances, typically up to 30 feet (10 meters). Bluetooth devices generally communicate at less than 1 Mbps.