Microwaves Definition and 80 Threads

Hello from Australia, I'm extremely worried. I rarely use mobile but unfortunately I had no choice but use a prepaid wireless usb modem which uses the same technology of the mobiles here and I have been using it about 10 hours a day for the last 9 months so if WI-FI gives cancer, then I'm...

Hi, Rather than jump on the other thread about microwaves, i thought id start this one! If i were to drill a couple of holes in a microwave oven in order to have a coil of plastic pipe with fluid flowing through it coming out of the holes, how would i protect myself from being cooked? I...

I am trying to work out the real component of the wavelength of microwaves in copper. I am given n2=er=-i sigma/eo omega where n is the refactive index er is the relative permitivity eo is the permitivity of free space i = sqrt(-1) omega is the frequency of the microwave sigma is the...

We are interested in looking at the effect of the pulsing of microwaves subjected to power and time of eg 50W for 10 seconds at 2.45GHz but pulsing the microwaves as well to investigate the added kill effect that the pulsing adds, comparing plate counts before irradiation, after non pulsed...

Homework Statement GSM networks use microwaves of 20 cm in wavelength. The energy carried by one trillion (10^12) photons of this wavelength is closest to ... Question 1 answers A)10-16 Joules b)10-15 Joules c)10-14 Joules d)10-13 Joules e)10-12 Joules Homework...

Doppler shift with microwaves...i think... Homework Statement Microwaves, which travel at the speed of light, are reflected from a distant airplane approaching the microwave source. It is found that when the reflected waves are beat against the waves radiating from the source, the beat...

Hello reader, I was heating some coffee in the microwave oven today when I had an idea come to me. Is it Possible to heat water with microwaves, (dielectric heating) to superheat water? Then allow it to form to steam, turn that steam into dry steam. And then use that to turn a generator...

I've noticed that honey reaches a boiling point quicker than the same amount of water. I've melted a few plastic honey containers before I learned my lesson. Physics-wise, why is that? I thought a microwave oven targeted water molecules. I know honey is mostly water, but why does it heat up...

I have tried searching for answers to these questions but i can't seem to find them, so if anyone could help me it would be greatly appreciated. How efficiently you can reflect microwaves? I know visible light can be reflected at 99.99% efficiency or something ridiculous like that, is it the...

A microwave generator can produce microwaves at any frequency between 10 GHz and 20 GHz. The microwaves are aimed, through a small hole, into a "microwave cavity" that consists of a d = 8 cm-long cylinder with reflective ends. Select all frequencies from those tabulated below which will...

What would happen? Why

Hello, friends! I've google about the question below but no success! The question is: Gps signals inside buildings are nonexistent or very weak, but mobile phone and am and fm radio signals are good, so the question is: why gps satellites and mobile phone comunications don't use emission...

Dear All, Please excuse my ignorance of physics. According to some Russian research 1 mW of microwave radiation could be considered safe for the brain (ie. it won't cause brain damage). I therefore considered that if a 1 W cellphone is damaging to the brain then perhaps it's a good idea to use...

Is it possible to injure your neighbor with microwaves using the heater of a microwave oven when there is a thick wall yours and your neighbor's apartments? I know this is a really weird questions, but that's because it's related to a really weird situation. A friend of mine does not get along...

And why can't food be cooked with X-rays or radio waves?

The amplitude of sound waves is commonly referred to as volume. What about for blue visible light, and microwaves? I'm guessing for the first one it's brightness. Btw I'm looking for a word answer, not the magnitude of the amplitude (not a numerical amplitude) Thanks for reading.

A compact disc contains an extremely thin sheet of aluminum. If you put a larger block of metal in a microwave oven along with a CD and turn the oven on, a) nothing significant happens b) only the metal will spark and then melt c) the metal will melt and the CD will spark d) only the CD...

i am interested in weather or not a salvaged magnatron from a microwave oven will be enough to interfer with electronics if it were to be housed in an aluminum box with a tube on the side that the magnatronwould be emitting from to (direct the emissions)?

hey guys I have a question ...I built a hydrogen cell and was testing it in my kitchen for a few hrs to see how much the water temp would rise.Now a while back our microwave gave up its ghost and would make some nasty elecrtical sounds when we would turn it on,so we only used it for the stove...

I don't know whether this is appropriate for this sort of forum, but what would be the difference between microwaving standard tap water and boiling it in a kettle? Not just any water, but hard London tapwater (eek), with all sorts of delicious impurities. There's a marked difference in...

Someone told me that the film badges used in nuclear plants respond to microwave radiation from microwave ovens, as well as to the ionizing radiation they're intended for. I don't understand how this could work. Can someone explain it, or is it just not true?

Can microwaves melt metal? As far as I know, it can't melt a spoon no matter how long you put it in a microwave oven. Is it possible to get microwaves to melt metal?

Can the microwaves emitted from a microwave that is turned on and running with nothing in it have an effect on nearby electronics, i.e. computers, cell phones, surround sound receivers?

I'm just curious. Why is it that we use microwave ovens to cook food and not some other wave of the EM spectrum? --thanks.

Hi everyone, we were looking at different ways of finding out the wavelength of a microwave in physics a few days back, and one of them was to soak a piece of paper in a solution and put it into a microwave iven, when this solution got hot/warm it changed colour to blue. Does anyone know what...

Sir, 1)Microwaves are directed normally at a plane metallic reflector. A detector moving along the normal to the reflector travels 15 cm from the first to the 11th successive of minimum intensity. What is the frequency of the microwave?(velocity of microwaves = 3 x 10^8 m/sec) I solved it...

can i use a prism to diffract(separate?) ultralight or microwaves, if so, how far into the spectrum will it go? for example, when i look at a rainbow, and the rainbow ends after the violet and before the red, does it really end? or am i just unable to see the missing wavelengths?

Hi everybody, I recently took a piece of meat from the freezer and put it in the microwave in order to defrost it. Then I realized that this actually shouldn't work. I don't see how you can heat ice in a microwave. So how does this work? I've tried it on ice cream (don't repeat that...

microwaves don"t pass thru the door of the microwave oven :confused: How come microwaves don"t pass thru the door of the microwave oven. Those small holes I believe have to do with this right? but how?

By "microwaves", I mean microwave ovens. My brother has recently read a paper that pointed out all kinds of reasons why microwaved food is bad for you, but he can't find the paper, and I'm just not convinced that there should be any problem here. Does anyone here know about this? BTW, he...