Lamp Definition and 173 Threads

Hi all, This is about installing UV lamps so I guess I should post this in the Electrical sub-forum. I am actually looking for a short but power UV lamps with the purpose of polymerization of chemical monomer. My original search parameter of lamps: -Able to hit up to 25mW/cm2. -Total...

I'm working on a project for my model railroad and I would like some help. I have a locomotive with a DC motor that runs it. This motor is powered by a power supply that ranges from 0-12VDC to control the speed of the train. The DC motor can pull as much as 1.5A. Also in the locomotive is...

Hello Forum, An optics question here. I'm using a Xenon continuous arc lamp as a source of broadband light together with a spectrometer for an absorption experiment. However the lamp is too bright and is saturating the spectrometer. Is there a standard way to reduce the...

Hi, I am just thinking and i got doubt that if one wire carries AC(3V) and other wire carries DC(3V) and on the other side if you conntect together followed by a diode and last with one lamp. What will happen in that situation to lamp.

Homework Statement The owner of a small restaurant needs to move a table in order to have space for a new display. Ordinarily, a lamp of mass m is hanging over the table, suspended from a string attached to the ceiling. With the table in a new position, the lamp needs to be moved. To this end...

"In the helium lamp an electron from the discharge impacts on a He atom, ionises it and at the same time excites it to a superposition of several states. For simplicity, let us consider only the states that are of practical importance and assume that the He+ ion immediately after the impact is...

Homework Statement Hi Please, what fringe pattern would be obtained with a sodium vapour lamp? Homework Equations The Attempt at a Solution I am guessing that a dominant yellow colour would be obtained. The sodium is almost acting like a monochromatic light and therefore has a...

Homework Statement A lamp is marked 12V/10W. the lamp is connected to 24V accumulator. in series with lamp you must then connect a resistor. Calculate the resistance of the resistor. Homework Equations The Attempt at a Solution

Question about the "starter" of a fluorescent lamp. Suppose the following circuit which is a simple fluorescent lamp. It consists of a "starter" connected in series to an inductor and this connected in parallel with the extremities of the lamp and to the voltages of the alternating current...

Hi Why do we have only sodium spectral lines in the sodium vapor lamp despite the very low concentration of sodium present in the lamp.

Homework Statement This is my first post on the site, so bear with me if this is a little unclear. A person wants to push a 7.2kg lamp across the floor. (a) Assuming the person pushes at a height of 60 cm above the ground and the coefficient of friction is 0.20, determine whether the lamp...

I have a undergrad college class where we have to do some sort of experiment and we were going to try this one http://mesoscopic.mines.edu/mediawiki/images/9/93/Microwave_flourescentlamp.pdf Is a vacuum chamber required? The article states it's inexpensive and we're trying to figure out how...

Hey all, When it comes to arc lamps, it looks like the safety concern everybody talks about is in regards to UV exposure. This, however, seems to be more suited for Hg sources instead for Xe sources. My question is in regards to whether there should be any concerns with the IR portion of the...

We're building a very high power xenon flashlamp with electrodes so far apart that some kind of pre-ionization is necessary to start the discharge. I dump 10,000 volts across the electrodes so I just need a few loose electrons to get the ball rolling. I've been using a Tesla coil to get a...

I need to illuminate a scene for a video inspection. Unfortunately it's a big scene and I don't have unlimited power. I though of using a strobe light triggered at 30Hz (or ideally 60Hz) and synced from the frame pulse of the video camera - so I get a bright pulse of light as each image is...

Homework Statement I have problems with calculation of the Zeemans effect. A natrium lamp is being placed in magnetic field with B=0.4T. Calculate the Zeemans effect for the states 3s j=1/2 and 3 p j=1/2 The only problem i get in this calculations is the Landes factor...can get the right...

Homework Statement i have to have my lab report ready in the next 1 hour and i am stuck. in my experiment we had a varied power supply , an ammeter and a voltmetter both with small error (and digital). i have taken about 15 measurements of potential difference and its respective current. the...

Homework Statement Light from a laboratory sodium lamp has two strong yellow components at 589.5923 nm and 588.9953 nm. How far apart in the first-order spectrum will these two lines be on a screen 1.00 m from a grating having 10,000 lines per centimeter? Homework Equations Grating...

Homework Statement Compute the cost per day of operating a lamp that draws a current of 1.90 A from a 110 V line. Assume the cost of energy from the power company is $0.0620 / kWh. NOTE: Enter your response with tenths precision. The Attempt at a Solution 1.90*110V*.0620*24 = .310992...

I need a professional pure English literature at this field, can you help me via some links?

Dear we have been asked to devise an experiment to find the resistance of a resistor using neon lamp. Can some help me please i have to submit it in next couple of days. I know about resistance but have no idea of neon lamp. Please help me making lab report.

Hi all! Problem. I have a light source (xenon-arc lamp) and wish to calculate the no. of photons emitted. It seems that I have to use chemical actionmetry (Potassium Ferrioxalate as Chemical Actinometer)? I need to know the no of photons emitted at all wavelengths given out by the lamp at a...

I apologize if the question is posed in a wrong forum. I've had a lamp similar to this one: http://upload.wikimedia.org/wikipedia/commons/4/42/Fluorescent_Lamp.jpg for about 2 years now. Ever since I bought it, when I turn the light off, every 30 to 50 s it emits flashes of light. One flash...

I am trying to determine at what angle a floor lamp would begin to fall over(tilt over). The lamp has a rectangular base and is a little top heavy. Once i determine its CG, how can i apply force diagrams and mathematics to determine at what angle it would begin to tilt? I could increase the...

If Light is EM wave, and antenna can emit EM wave, then can an antenna emit light? Is this a matter of designing the antenna correctly or is there something fundamentally wrong about this reasoning?

Homework Statement I'm looking through some old IB exams, and I came across this (supposedly fairly easy)question. I'm having some problems, and I feel there's something really basic I'm missing. http://img52.imageshack.us/img52/5139/physicsproblem.jpg...

Hi there! (It's not actually a homework question) I just wanted to ask where does the lamp get oxygen to burn on in coal mines. So there must be an inlet for air. Of course it is explained in my book that as the wire mesh distributes the heat therefore the temperature does not rise to the...

i was working with a spectrometer and the aim of the experiment was to find the refractive index of a prism for various colors. i was asked specifically to use mercury vapor lamp and was insisted not to use sodium vapour lamp. why is it so?

Homework Statement Fluorescent lamps use phosphors to produce visible light from UV light. This is done by absorbing the UV light and then re-radiating it using a different wavelength. This is a a. one way process b. reversible process c. process that produces continuous spectrum d...

I bought an energy savings lamp. The white wall really looks like daylight, but the bananas look green! I suppose it's impossible to recreate all colour impressions simultaneously without recreating the complete Planck spectrum. My question is: Why don't they allow normal light bulbs (in...

Homework Statement Hi, I found the following example in a high school physics book about electrical circuits. There's something about the example that I don't get, so I hope you can help me out. I give you the example text and the solution, and then I explain what I don't understand...

We have Compact Fluorescent lamps hooked up to a dimmer circuit, and they are striating (flashing) at exactly the same frequency, even at full power setting, which tends to tell me it's circuit related. Now I know that a dimmer circuit uses a triac to chop up the waveform, and therefore we're...

how to calculate lamp resistance and lamp voltage to light up a 18W tubelight?

Homework Statement Part a) The emission spectrum for Sodium lamp contains a reasonably bright red line in its spectrum. What is its origin? Part b) The possible transitions between electron energy levels for Sodium were analysed. There were no transitions between the s series (s subshell)...

Hi all, Let's say i have the following: I approach a charged-up VDG holding a fluorescent lamp. The end nearest the VDG is labelled A and the end furthest away from the VDG is labelled B. My hand is holding the lamp in the middle, i.e between ends A and B. The region inside the lamp...

I'm looking at a problem where a battery of negligible internal resistance is connected to two lamps L and N in parallel with each other, then through in series to a 3rd lamp M. The question asks if the filament of one of the lamps in parallel N breaks then what happens to the brightness of the...

Homework Statement A 3.0-kg lamp is suspended by a wire from the ceiling of an elevator. What can you conclude about the tension in the wire under each of the following circumstances? (Give a numerical result, or a range of possible numerical results, or if you can’t conclude anything...

Last night i awoke in the middle of the night to find that my bedside lamp was on. How is this possible? I don't remember turning it on myself and it's not a touch lamp. It really freaked me out. Is there anyway that it is in fact possible for it to have turned on?? Any help would be...

Homework Statement i understand that the wavelength given off by a sodium vapor lamp is 589nm, is this why there is a dark line in the continuous spectrum at 589mn? Homework Equations The Attempt at a Solution

Homework Statement Two 1.50 V batteries-with their positive terminals in the same direction-are inserted in series into the barrel of a flashlight. One battery has an internal resistance of 0.255 ohms, the other has a resistance of 0.153 ohms. When the switch is closed, a current of 600 mA...

Learning is ‘Scuba with a Lamp’ I moved to Dallas in 1980 and decided to learn scuba diving. I took a YMCA scuba class and after completing the class joined, with many fellow members of my class, a dive club sponsored by the Y. We shortly thereafter took a one week dive trip to Mexico...

Hello! I have one question. How the circuit of the dynamo light of bicycle is closed? Isn't the coil got two wires, one from the start, and one from the end. Thank you. Regards. Here is one picture: http://www.windpower.org/kres/dynbde04.gif

Hello, I'm having problems with this question. I'm not exactly sure how to determine how much watts in a day, or in a second the lamp takes. Homework Statement Theres a lamp that absorbs 60 W when connected to a 120-V source. Q: Find the cost of operating the lamp for 24 hrs when...

[SOLVED] Electrical characteristics of a lamp. Experiment. GCSE Science... Electrical characteristics of a lamp. The Aim is to investigate the relationship between current, voltage and resistance in a lamp. Method: 1) Set up the circuit as in the diagram (with three cells) 2) Set the...

Hi, I am new here so please bare with me. I know a bit about electrical and Electronics but I do not recall the formula for this application...it is a long question..please help! Here it is. Six cells are connected in series to form a battery. Each cell has a rating of 1.5 volts and 1 amp...

Homework Statement what does k and n relate to? i can work them out but don't know exactly what they are. Homework Equations I=kV^n The Attempt at a Solution i think the k and n have something to do with temperature and the tungsten metal in the lamp (coefficient of resistance?)...

Question: At the bottom of a glas bath lies a mirror covered by 20cm of water.In the air,30 cm above the water there hangs a lamp.Find the distance from the mirror at which an observer looking into the water will see the image of the lamp in the mirror Relevant Formula: apparent shift...

Homework Statement A lamp hangs vertically from a cord in a descending elevator that decelerates at 1.4 m/s2. (a) If the tension in the cord is 56 N, what is the lamp's mass? (b) What is the cord's tension when the elevator ascends with an upward acceleration of 1.4 m/s2? Homework...

Question is Why does a desk lamp often has small holes near the top of the metal lampshade. How do these holes keep the lamp cool. This is what i think. Heat travels upward by air convection. Since air is a poor conductor, very little heat travels sideways. That is my reason what do u...

Hi guys I'm new here and I require some help with a project I'm working on. I'm building a lamp prototype and i need to use a potentiometer to act as a dimmer. The pot needs to fit inside a 25mm ID tube, and is connected directly to the mains. First of all is this possible? I think I have found...