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Answer :

We have the thickness of books = \(5 \times 20 = 100 mm\)

Also, the thickness of 5 paper sheets = \(5 \times 0.016 mm = 0.080 mm\).

Total thickness of the stack = \(100 mm + 0.080 mm = 100.080 mm = 1.0008 \times 10^2 mm\)

- 1.Express the following numbers in standard form: (i) 0.0000000000085 (ii) 0.00000000000942 (iii) 6020000000000000 (iv) 0.00000000837 (v) 31860000000
- 2.Express the following numbers in usual form. (i) \(3.02 × 10^{-6}\) (ii) \(4.5 × 10^4\) (iii) \(3 × 10^{-8}\) (iv) \(1.0001 × 10^9\) (v) \(5.8 × 10^{12}\) (vi) \(3.61492 \times 10^6\)
- 3.Express the number appearing in the following statements in standard form. (i) 1 micron is equal to \(\frac { 1 }{ 1000000 }\) m. (ii) Charge of an electron is 0.000,000,000,000,000,000,16 coulomb (iii) Size of a bacteria is 0.0000005 m (iv) Size of a plant cell is 0.00001275 m (v) Thickness of a thick paper is 0.07 mm.

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