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The light given by sodium vapor depends on whether it is a low-pressure or high-pressure lighting system. Low pressure sodium lamps produce a yellow-green light and are less-common today, while high-pressure sodium-halogen produces an orange light. Both types of sodium lighting uses the element sodium, which is heated by a current flow until it becomes luminescent.
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∙ 16y ago
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∙ 6y agoAs electric current passes through a sodium-vapor lightbulb, it ionizes the gas mixture. The mixture warms up and the heat cause the sodium to change from a solid to a gas.
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∙ 6y agoThe electric discharge excit sodium atoms and a light with the wavelength 589,3 nm is emited.
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∙ 15y agoan emission spectrum
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∙ 13y agoan emission spectrum.
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What is a similarity between electric heater and an electric bulb?
both use an electric current running through a material that somewhat conducts electricity to produce heat, and the light bulb also uses it to make light
How can you tell if a streetlight is a sodium vapor lamp?
The light in Sodium Vapour lamp is from an atomic emission process whereas in Mercury Vapour Lamp it is, finally, from fluorescence emission. The mechanism of light emission in a sodium vapour lamp is simple and straight-forward. The filaments of the lamp sputter fast moving electrons, which hit the sodium atoms(vapour) causing the valence electrons of the sodium atoms to excite to higher energy levels and the electrons thus excited relax by emiting the characteristic monochromatic bright yellow light(589nm). The mechanism in mercury vapour lamp is more involved and sequential. The sputtered electrons from the filaments, after having been accelerated by high voltage, hit the mercury atoms. Here also, the excited electrons of mercury atomsrelax by emitting characteristic but ultravilot(254nm,invisible) light. The photons of this ultravilot light fall on the fluorescent layer on the inner walls of the tube and excite the molecular bonds of the fluorescent material to various electronic and vibrational energy states. Hence, the light from the mercury vapour lamp is white. The basic difference between the two is, the former works by electric discharge (passage of electricity through sodium vapours at high/low pressure) while the latter works through the combined effect of electric discharge through mercury vapours and fluorescence from phosphors (luminescent materials). Although sodium vapour lamps produce much higher light output (about 90 lumens/watt) they cannot be used in lighting applications where colour-rendering property is very crucial. This is because most of the light emitted from a sodium vapour lamp is concentrated in the yellow part of the visible spectrum (around 580-590 nm) On the other hand, a mercury vapour lamp is quite suitable for lighting applications. This is because, the mercury vapour lamp can feed almost the entire visible region (380-780 nm) of the human visual system. Conventional fluorescent lamps can also be called as low-pressure mercury discharge lamps. In this system, when electric discharge strikes mercury vapours held at low pressure ( a few mm of mercury) it produces a lot of ultravilot radiation dominantly at 254 nm inside the column of the discharge tube. This UV radiation when impinging on the white coating made of fluorescent materials coated inside the discharge column of the tube will generate white light(called daylight). Light output from a fluorescent lamp is moderate (60 lumens/watt) while the colour-rendering index is high. posat by Chinmoy kanjilal and Tushar dhara,research scientists,SMIT,Sikkim,India.
Would a light bulb light up when placed in an aqueous solution of sodium chloride but not solid sodium chloride?
Yes
What is a lighting bolt?
A lighting bolt is a strike of light through the sky and if your looking this up WOW!:PIt is a lightening discharge between/within clouds and the ground
Why is sodium called a photosensitive metal?
It is so small that when sodium is exposed to the sun light, the energy of sun light is enough to cause the ionization of sodium metal. Hence it is called a photo-sensitive metal.
What device produces light by running an electric current through a gas?
Electric discharge
The light given off by electic discharge through sodium vapor is?
Orange, it is often used in street lighting.
What process do car headlights use to emit light?
Electric Discharge- the process of emitting light because of electricity passing through a gas.
In a neon light when is the light given off?
A red light, after an electric discharge in the lamp.
What is the meaning of sparks?
# A flash of light, especially a flash produced by electric discharge. # A short pulse or flow of electric current.
What does every element emit if it is heated by passing an electric discharge through its gas or vapor?
A specific pattern of light. This permits elements to be identified by an instrument known as a spectroscope.
What is the difference between an electrical insulator and an electric discharge?
An electrical insulator is a material whose internal electric charges do not flow freely, and therefore make it nearly impossible to conduct an electric current under the influence of an electric field. This contrasts with other materials, semiconductors and conductors, which conduct electric current more easily.Electric discharge in gases occurs when electric current flows through a gaseous medium due to ionisation of the gas. Depending on several factors, the discharge may radiate visible light.
How do street lights produce light?
They produce light by using mercury vapor :D=======================Answer #2:Some (not many) pass electric current through mercury vapor, causing it to glow violet.Some pass electric current through sodium vapor, causing it to glow yellow.Some pass electric current through a thin wire, causing it to heat and glow ...a process is identical to that in every incandescent light bulb in your house.Some burn natural gas.
What is an electric spark?
An electric spark is a form of electrostatic discharge that happens in the event that an electric field produces an ionized electrically conductive channel that results in emission of light and sound.
What gives out a light if an electric current flows through it?
A light bulb in an electric circuit when electricity reaches it.
When electric current flows through the metal filament of light bulb electric energy is converted to?
Heat and light.
What would happen if one photon of light passes through an electric field?
Nothing in our everyday existence suggests that an electric field has any influence on light shining through it.
