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Class 10 > Learn Class IX-X Tuition > Why do we have sodium vapor lamp in the streets and...
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Why do we have sodium vapor lamp in the streets and not mercury vapour lamp?

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Ionisation enthalpy of sodium is lower than mercury....due to which sodium atoms get ionised easily by heat produced by electricity in the lamp.
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Maths and physics teacher till engineering level

due to low ionisation enthalpy of sodium as compared to mercury
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I.E of sodium is lower than mercury. that's why sodium atoms get ionized easily by heat produced by electricity in the lamp and it have well tendency to maintain over heating.
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Because the high-pressure sodium arc is extremely chemically reactive, the arc tube is typically made of translucent aluminum oxide
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Physics by Ashwani Sir

Because the high-pressure sodium arc is extremely chemically reactive, the arc tube is typically made of translucent aluminum oxide. This construction led General Electric to use the tradename "Lucalox" for their line of high-pressure sodium lamps. Xenon at a low pressure is used as a "starter gas" in...
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Because the high-pressure sodium arc is extremely chemically reactive, the arc tube is typically made of translucent aluminum oxide. This construction led General Electric to use the tradename "Lucalox" for their line of high-pressure sodium lamps. Xenon at a low pressure is used as a "starter gas" in the HPS lamp. read less
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`White light consists of seven colors - VIBGYOR. During foggy days, air is highly humid and contains lot s of tiny water droplets which can act like a prism. So, if white light is used in automobile head lights and street lamps, water droplets will split into its component colors,thereby,creating a circular...
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`White light consists of seven colors - VIBGYOR. During foggy days, air is highly humid and contains lot s of tiny water droplets which can act like a prism. So, if white light is used in automobile head lights and street lamps, water droplets will split into its component colors,thereby,creating a circular rainbow around each light source. This will affect clarity of vision and lead to accidents. in order to avoid this effect, monochromatic ( yellow) light source is used. read less
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