Palms

The filament in an incandescent light bulb is made from tungsten. The light bulb is plugged into a 60 V outlet and draws a current of 1.04 A. If the radius of the tungsten wire is 0.0050 mm, how long must the wire be?

Resistance = resistivity x length/area
ρ tungsten = 5.65 10^-8 Ω /m
R = V / I = 60/ 1.04 = 57.6923 Ω

link Resistivity Calculation http://hyperphysics.phy-astr.gsu.edu/hbase/electric/resis.html#c4

lenght wire 0.08 m

Goodbye

In a Tungsten bulb, how electrons carry energy from power source and how they convert energy into photons?

In the Tungsten filament eclectic energy is used up to raise the temperature of the filament.

Rise in temperature is the indication of increase in kinetic energy of the electrons surrounding each atom of the tungsten filament.

Electrons jump up to new higher energy levels surrounding the nucleus .

While these electrons return to lower levels, the corresponding energy difference are emitted as bundles of energy or photons.
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I am looking into buying and engraving a tungsten or tungsten carbide ring with an image on the exterior of the ring. Has anyone had any experience with some sites or companies for this kind of thing?

I bought my husband’s wedding ring from http://www.tungstenworld.com/, and they can engrave their rings. (And before anyone comments how if there is an emergency and they cannot cut the ring off…they can…read the FAQ page.)

From the FAQ page:
"Only at Tungsten World can you get a truly custom engraving on your tungsten ring.

It is possible to have any of our rings engraved using our laser etching system. To have a ring engraved, select the product and click "Add Laser Engraving" above the red "ADD TO CART" button. Type your message in the text box and wait for your message to appear, you can select between the different fonts to the one you desire. After you have confirmed your engraving for spelling, capitalization, and spacing; click the "I confirm…" button to proceed with your order. The cost for etching is $25 per ring, and may take 1-2 business days. We are able to engrave up to 30 characters per ring (counting spaces). Once the item is in your shopping cart, please confirm your personal message for accuracy before continuing the checkout process. Congratulations, your personal interior engraving will appear as it does on your screen when your ring is delivered."

Also, how does it’s conductivity (high or low) contribute to it being the best filament in light bulbs?
This is for my A level physics coursework where we have to give a presentation on a chosen material (tungsten) within a context (light bulbs). For this I need a range of sources, one of which can be an expert (guess who’s going to be my expert!).
Thank you so much.

here goes , i will give the name of the metal first , then the symbol for that element , then last the conductivity in 10^6 cm ohms , silver Ag 0.63 , copper Cu 0.596 , gold Au 0.452 aluminium Al 0.377 ,beryllium Be 0.313 , barium Ba 0.3 , calcium Ca 0.298 ,magnesium Mg 0.226 , rhodium Rh 0.221 , sodium Na 0.21 , iridium Ir 0.197 , tungsten W 0.189 molybdenum Mo 0.187 cobalt Co 0.172 , part two of your question , once upon a time Tungsten and osmium were combined and because Tungsten was known as wolfram you get the name OSRAM . tungsten has a very high melting point and you need the high Resistance so that it gets hot and gives you your light , and a lot of energy wasted in heat . i suggest you also take a close look at my source ,

I need answer ,Please help..
The lighting of a room consists of 70% fluorescent lamps and %30 tungsten lamps.From a distance a lamp seen to have failed.Assuming that flourescent lamps have ,on average,7 times the lifetime of a tungsten lamp but both types fail randomly,What is the probability that the failed lamp is a tungsten type?

on an average, there will be 7 failures of a tungsten lamp
for every failure of a fluorescent one

P[failed lamp is tungsten] = 7*0.3 / (7*0.3 + 1 *0.7)

= 0.75
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I want to add a gold ring around the inside of my fiance’s tungsten carbide wedding band. Is it even possible?

sure, it is possible. I’m sure you realized that this will make the ring smaller?

You can heat shrink it on, for one method. Fabricate the ring a small amount larger than the opening (you can calculate the amount), heat up the tungsten part, insert the cold gold ring, and let the outer part cool to a permanent fit. The TC and the ring both have to be flat where they join.

Or you can cut a groove on the inside of the tungsten into which the gold part will fit. In either case, the gold part has to be of the correct size and shape. But I don’t think you can do this with TC.

But I just realized you said tungsten carbide, not tungsten, but a bit of research says this has been done.

I was shooting flowers yesterday with my Nikon D200, and I was using natural window light, and using tungsten to fill in. The problem was that when I set the WB for Tungsten, the main light looked very blue, but the Tun. light was fine. And it went the opposite way too.

What WB should I use?

Normally, you don’t want to mix light sources like that. Get some blue get to throw over your tungsten light to make it closer to daylight color.

If you can’t do that, you could try to do a "split" white balance at about 4200. The tungsten will be a little orange, and the daylight will be a little blue. If done right, it might look kind of like a night shot.

I’m in the market for a cast tungsten wood burning (or any other kind of tungsten stove for that matter) stove for my house. We like to heat the house with wood, and we would prefer a stove that can withstand a great amount of heat.

I’ve never heard of such a thing. Cast iron, which can contain tungsten, is what wood stoves are made of if they aren’t sheet steel or masonry. What were you planning on burning in this stove, that a cast iron stove isn’t sufficient to take the heat generated? Wood can only burn so hot. Any cast iron stove can handle the heat of burning wood, as long as the stove is operated properly. If you leave the dampers open too long or too wide, it’s possible to get temperatures hot enough to start softening cast iron. A wood stove should never be operated that hot, mainly due to the heat that would be going up the chimney with the possibility of starting a chimney fire or setting fire to parts of the house around the chimney, and also because it can cause irreversible damage to the stove. Millions of people find the heat generated by a normal cast iron stove to be sufficient to heat even some fairly large houses. If it isn’t, you haven’t installed a large enough stove or you’re not operating it properly.

A note on burning temperatures. I have a sheet steel wood stove. I have a thermometer placed on the stovepipe, 18 inches above the firebox. At normal operating temperature, the thermometer registers around 400F but during the initial heating it has gone up to as high as about 900F, temporarily. If the stovepipe is that hot, it must be hotter inside the stove and so far the stove has been fine. The recommended temperature for the flue thermometer to be at, for best burning, is between 300 and 500F.

I have a Tungsten ring that I bought for my husband but he broke out from it. It’s in perfect condition no scratches or anything. I tried taking it to 2 pawn shops but they don’t take tungsten rings. I have it up on ebay right now but nothing is happening. It’s been on there for a few days. Any idea on where I can take it to sell it? I bought it over a year ago at walmart.

Do contact on see my source. they are solved you issue. still there are %10 off sale. also they are giving All of our tungsten carbide rings and wedding bands are backed by our no questions asked Lifetime Warranty.

I want to know if a bullet (Armor piercing) can go through a tungsten carbide plate. Similar to the looks of a steel plate. So any info would be nice.

Thanks.
Hey, C. I was thinking the same thing. Hey, at least it wouldn’t get scratched lol.
It is 3 inches thick.

how thick?