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What is LED?...

What is LED?

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Rohan was studying in a science college and was staying with his grand father. One day, the old torch which was being used by Rohan's grand father stopped wirking. He asked Rohan to purchase a new torch for him. Rohan himself made a torch using LED with a small recharge battery and gave it to his grand father as a gift. Rohan explained the advantages of LED over a bulb. Rohan's grand father was very happly. Read the above passage and answer the following question: (i) What is LED ? Name the two materials used in making LED, whose light falls in the visible region. (ii) Why LED is a better choice than a bulb in torch? (iii) What do you think about the attitude of Rohan towards his grand father?

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