Express the number appearing in the following statements in standard form.

(i) 1 micron is equal to

(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

(i) 1 micron = 10-7 m


(ii) 0.000,000,000,000,000,000,16 coulomb. = 16/100000000000000000000


→0.000,000,000,000,000,000,16 coulomb = 16 × 10-20 = 1.6 × 10-19 coulomb


(iii) 0.0000005 m = 5/10000000 = 5 ×10-7 m


(iv)0.00001275 m = 1275 /100000000 = 1275 × 108 = 1.275 × 1011


(v) 0.07 mm = 7/100 = 7 ×10-2 m

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