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The Light Bulb
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What converts the UV light to visible light?
The fluorescent phosphur coating inside the tube/bulb
So, how do we finally see objects through a CFL bulb?
The UV light emited by the mercury vapour, is transferred to the fluorescent surface to produce light
What form of energy/light is released from the mercury vapour?
UV light
What do the electrons do to the mercury vapour?
It excites the mercury vapour transferring a lot of energy into the mercury atoms
What is Mercury?
It is a liquid Metal found in Thermometers
What is a CFL bulb made of?
A pair of electrodes, and a tube made of an unreactive gas, a bit of mercury vapour & a phosphur coating inside
What do electrodes do?
They let out a lot of electrons into the tube
What is an electrode?
It is a conductor through which electricity leaves
Can we see Infrared light? Give reason
We cannot see that part of the EMS in which it lies
Why isint the Incandescent bulb used a lot today?
Because 90% of the light it emits is lost in Infrared light
What different colors does it emit when you turn on the bulb?
First red, then orange, then yellow, last white
To what temperature does the bulb normally rise to?
2000 degrees centigrade
What kind of a gas is Argon?
It is an Inert/ Noble Gas. It is Non-reactive
So, how do we make sure that tungstan doesn't react with air?
Fill the bulb with a non reactive gas called Argon
Will Tungstan normally react with air ? What does it become?
Yes, it react with air to form Tungstan Oxide
What is the thin coiled wire inside the bulb made of?
Tungstan
What is the Normal round Glass bulb called?
Incandescent Bulb
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