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  1. Chapter 12 Class 8 Exponents and Powers
  2. Serial order wise

Transcript

Ex 12.2, 3 Express the number appearing in the following statements in standard form. (i) 1 micron is equal to 1/1000000 m. 1 micron = 1/1000000 m = 1/ใ€–10ใ€—^6 m = ๐Ÿร—ใ€–๐Ÿ๐ŸŽใ€—^(โˆ’๐Ÿ”) m Ex 12.2, 3 Express the number appearing in the following statements in standard form. (ii) Charge of an electron is 0.000,000,000,000,000,000,16 coulomb. 0.000,000,000,000,000,000,16 coulomb = 16/100,000,000,000,000,000,000 = 16/ใ€–10ใ€—^20 = 16ร—ใ€–10ใ€—^(โˆ’20) = (1.6ร—10) ร— ใ€–10ใ€—^(โˆ’20) = 1.6 ร— (10ร—ใ€–10ใ€—^(โˆ’20) ) = 1.6 ร— ใ€–10ใ€—^(1 + (โˆ’20)) = ๐Ÿ.๐Ÿ” ร— ใ€–๐Ÿ๐ŸŽใ€—^(โˆ’๐Ÿ๐Ÿ—) coulomb (Using ๐‘Ž^๐‘šร—๐‘Ž^๐‘›=๐‘Ž^(๐‘š + ๐‘›)) Ex 12.2, 3 Express the number appearing in the following statements in standard form. (iii) Size of a bacteria is 0.0000005 m 0.0000005 m = 5/10000000 = 5/ใ€–10ใ€—^7 = 5 ร— ใ€–๐Ÿ๐ŸŽใ€—^(โˆ’๐Ÿ•) m Ex 12.2, 3 Express the number appearing in the following statements in standard form. (iv) Size of a plant cell is 0.00001275 m 0.00001275 m = 1275/100000000 = 1275/ใ€–10ใ€—^8 = 1275 ร— ใ€–10ใ€—^(โˆ’8) = (1.275 ร— ใ€–10ใ€—^3) ร— ใ€–10ใ€—^(โˆ’8) = 1.275 ร— (ใ€–10ใ€—^3ร—ใ€–10ใ€—^(โˆ’8)) = 1.275 ร— ใ€–10ใ€—^(3 + (โˆ’8)) = 1.275 ร— ใ€–๐Ÿ๐ŸŽใ€—^(โˆ’๐Ÿ“) m (Using ๐‘Ž^๐‘šร—๐‘Ž^๐‘›=๐‘Ž^(๐‘š + ๐‘›)) Ex 12.2, 3 Express the number appearing in the following statements in standard form. (v) Thickness of a thick paper is 0.07 mm 0.07 mm = 7/100 = 7/ใ€–10ใ€—^2 = ๐Ÿ•ร—ใ€–๐Ÿ๐ŸŽใ€—^(โˆ’๐Ÿ) mm

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Davneet Singh
Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 9 years. He provides courses for Maths and Science at Teachoo.