# Ex 12.2, 3 - Chapter 12 Class 8 Exponents and Powers

Last updated at Dec. 19, 2018 by Teachoo

Last updated at Dec. 19, 2018 by Teachoo

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/ใ10ใ^6 m = ๐รใ๐๐ใ^(โ๐) 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/ใ10ใ^20 = 16รใ10ใ^(โ20) = (1.6ร10) ร ใ10ใ^(โ20) = 1.6 ร (10รใ10ใ^(โ20) ) = 1.6 ร ใ10ใ^(1 + (โ20)) = ๐.๐ ร ใ๐๐ใ^(โ๐๐) coulomb (Using ๐^๐ร๐^๐=๐^(๐ + 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/ใ10ใ^7 = 5 ร ใ๐๐ใ^(โ๐) 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/ใ10ใ^8 = 1275 ร ใ10ใ^(โ8) = (1.275 ร ใ10ใ^3) ร ใ10ใ^(โ8) = 1.275 ร (ใ10ใ^3รใ10ใ^(โ8)) = 1.275 ร ใ10ใ^(3 + (โ8)) = 1.275 ร ใ๐๐ใ^(โ๐) m (Using ๐^๐ร๐^๐=๐^(๐ + 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/ใ10ใ^2 = ๐รใ๐๐ใ^(โ๐) 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 10 years. He provides courses for Maths and Science at Teachoo.