(a) Answer the following questions: ) What is the meaning of Ma-ngal? (ii) Why did the joy of the mother on the birth of Ma-ngal turn into despair? (iii) Why did Ma-ngal's mother refuse to leave him alone as he grew up? (iv) What is seeing'? How old was Ma-ngal when he was admitted in the school for the () blind? (vi) When did Ma-ngal experience a change in the attitude of his parents towards his blindness? (vii) What is braille? (viii) How did Ma-ngal save his house from burning? (ix) Who was Helen Keller? How could Helen Keller read when a person spoke to her?
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Solution: Half life is deifned as the time taken to reduce the concentration to half. Therefore the time required to reduce the initial concentration to its 1 by 16th value is 40.277 seconds.
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