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If `log_10 7=0.8451,` find the position of the first significant figure in `7^-20.`A. 15B. 20C. 17D. 18 |
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Answer» Correct Answer - C `"Let" x = 7^(-20)`. Then, `"log"_(10) x = -20 "log"_(10)7 = -20 xx (0.8451) = -16.9020` `"log"_(10) x = -17 + 1 - 0.9020= bar(17). 0980` Hence, position of first significant figure is 17 th. |
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