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If the tungsten filament of a lamp has a cross-sectional are of 5x10-9 m2 how long must it be have a resistance of 120 ohms at 20 degrees Celsius?
To find the length of the tungsten filament, you can use the formula: R = ρ * (L/A) Where R is the resistance (120 ohms), ρ is the resistivity of tungsten, A is the cross-sectional area (5x10^-9 m^2), and L is the length of the filament. Rearranging the formula to solve for L gives: L = R * A / ρ Given the resistivity of tungsten at 20 degrees Celsius, you can calculate the length of the filament.
What test could you do on an iodine crystal to comfirm thst iodine is a non metal?
You can conduct a conductivity test on an iodine crystal to confirm that iodine is a non-metal. If the crystal does not conduct electricity, it indicates that iodine is a non-metal because non-metals are typically poor conductors of electricity.
If a heat lamp were introduced into the room at position B on the Ideal map what changes would occur in the isotherm values?
Introducing a heat lamp at position B in the room would increase the temperature at that specific location, causing the isotherm values to shift towards higher values around that area. This would create a new thermal gradient in the room, with higher temperature values radiating outwards from the heat lamp.
Is sodium lamp a monochromatic lamp?
No, a sodium lamp is not a monochromatic lamp. It emits light in a narrow range of wavelengths, primarily the yellow-orange region of the spectrum, but it is not strictly monochromatic as it produces a broader spectrum of light compared to a true monochromatic source.
What is a halogen used for in a halogen lamp?
Halogen light bulbs are used because:they can be operated at a higher temperature than can be used for ordinary light bulbs. This results in less heat production compared to light output and an overall much higher efficiency in the conversion of the energy which is input - electrical energy - to the energy which is output as visible light.andthey have a significantly longer useful life than ordinary incandescent light bulbs.Technical noteThe invention of halogen lamps was based on the discovery of a special physical feature: when small amounts of a halogen gas were added to the contents of the light bulb, these were found to help to return large quantities of evaporated tungsten atoms back to the filament. This resulted in a significantly longer lifetime of such lamps.General note about how all incandescent filament light bulbs operateAn electrical current travelling through the filament of a light bulb makes it glow white-hot and generate both light and heat because of the electrical resistance of the filament.The filament is normally mounted within a special mixture of noble and/or inert gases held inside the glass enclosure of the light bulb, held at a pressure which is close to a vacuum.The special mixture of gases prevents the filament from oxidizing and burning away, which would happen extremely quickly if it glowed white-hot in normal air which contains oxygen.
What is lamp types?
There are two types of lamps the tungsten halogen lamps and incandescent lamps. Tungsten Halogen Lamps are similar to incandescent lamps and produce light in the same manner from a tungsten filament; however the bulb contains a halogen gas (bromine or iodine) which is active in controlling tungsten evaporation, whereas the incandescent lamp suppresses tungsten evaporation.
What material is used for fillament in tungsten lamp?
tungsten
Which material is used for for filament in tungsten lamp?
i believe it is cadnium.
Difference between tungsten lamps and carbon lamps?
tungsten lamp has got inert gas argonsometimes iodine is added to improve intensity carbon filament produces less light than tungsten lamp but it radiates much less energy in the form of heat waves
What are the characteristics of the tungsten lamp spectra?
The characteristics of tungsten lamp spectra include a continuous spectrum with peaks in the visible and infrared regions, caused by the thermal radiation of the heated tungsten filament.
What is the purpose of halogen gas in a tungsten-halogen lamp?
The purpose of halogen gas in a tungsten-halogen lamp is to increase the lifespan and efficiency of the lamp. The halogen gas helps to recycle evaporated tungsten back onto the filament, preventing blackening of the glass and extending the life of the lamp.
Why the lamp lights up?
Incandescence of a finely coiled tungsten wire.
What is the nature of the slope of the voltage-resistance characteristics for the carbon lamp?
for Tungsten lamp the slope of the curve is positive where for carbon it is negative
What is used to make globe filaments?
The first successful light bulb filaments were made of carbon (from carbonized paper or bamboo). In 1902 the Siemens company developed a tantalum lamp filament. From 1898 to around 1905 osmium was also used as a lamp filament. In 1906 the tungsten filament was introduced
What are you hearing when you shake a light bulb?
The piece of coiled wire made of Tungsten (Wolfram) that heats up and glows in the lamp.
When did sir Humphrey Davy invent iodine?
Sir Humphry Davy did not invent iodine. Iodine was discovered by French chemist Bernard Courtois in 1811. Davy was instrumental in the development of the miner's safety lamp.
What light source does Spectrophotometry utilizes?
Spectrophotometry utilizes a light source such as a tungsten lamp, deuterium lamp, or xenon lamp to produce light at specific wavelengths. The light is then passed through a sample to determine its absorbance or transmittance at different wavelengths.
