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Chapter 7: Q7. (page 463)

Express each number in scientific notation.

0.00021

Short Answer

Expert verified

0.00021 can be written in scientific notation as 2.1脳10鈭�4.

Step by step solution

01

Step 1. Write steps to convert standard form to scientific notations.

1. Move decimal point to the right until it is the first nonzero digit. It is a real number x.

2. Count the numbers of decimal places m and direction in which decimal point is moved.

3. If the decimal point is moved towards right then write the number asx脳10鈭�m and if the decimal point is moved towards left then write the number as x脳10m. Remove the unnecessary zeros.

02

Step 2. Apply steps to convert standard form to scientific notation.

Move decimal point towards right till it reaches first nonzero number and then count the number of decimal places.

0.00021鈫�00002.1

Number of decimal places, m=4.

03

Step 3. Write a given number in scientific notation.

As the decimal point is moved towards the right, write the number as x脳10鈭�m.

2.1脳10鈭�4

Therefore,0.00021 can be written in scientific notation as 2.1脳10鈭�4.

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Most popular questions from this chapter

ASTRONOMY Physicists estimate that the number of stars in the universe has an order of magnitude of 1021. The number of stars in the Milky Way galaxy is around 100 billion. Using orders of magnitude, how many times as many stars are there in the universe as the Milky Way?

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