What was the active medium used in the first working laser ever constructed?
A diamond block
Helium-neon gas
A ruby rod
Carbon dioxide gas
What was the active medium used in the first working laser ever constructed?
What does EPROM stand for? |
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Chemical formula for water is |
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The gas usually filled in the electric bulb is |
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Washing soda is the common name for |
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Quartz crystals normally used in quartz clocks etc. is chemically |
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Which of the gas is not known as green house gas? |
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Bromine is a |
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The hardest substance available on earth is |
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The variety of coal in which the deposit contains recognisable traces of the original plant material is |
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Tetraethyl lead is used as |
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