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Why do we have sodium vapor lamp in the streets and not mercury vapour lamp?

Asked by Guru Venugopal 28/05/2016 Last Modified 28/05/2016

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Ramu is a shoe manufacturer and he wants to directly exchange shoes for rice without the use of money. Now he will have to look for a rice growing farmer who not only wants to sell rice but also wants to buy the shoes in exchange.
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