51.

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

1 micron is equal to m.

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

Charge of an electron is 0.000,000,000,000,000,000, 16 coulomb.

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

Size of a bacteria is 0.0000005 m

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

Size of a plant cell is 0.00001275 m

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

Thickness of a thick paper is 0.07 mm.

In a stack there are 5 books each of thickness 20 mm and 5 paper sheets each of thickness 0.016 mm. What is the total thickness of the stack?

Write each of the following in standard form:

(i) 1,50,000,000,000                              (ii) 0.000007

(iii) 0.0016                                         (iv) 0.00001278

The distance of the sun from the earth is 1,49,600,000,000 m. Express it in a standard form.

Express the following numbers in standard form:

(i) 0.00035            (ii) 4050000

Express the following numbers in usual form:

(i)        (ii)    (iii)