Q142 of 196 Page 249

The paper clip below has the indicated length. What is the length in standard form.

The length of the paper clip is 0.05 m.


There are 2 decimal places after the point.


⇒ 0.05 =


100 can be written as 102.


⇒


We know that by laws of exponents, .


⇒


∴ The length of the paper clip in standard form is 5 × 10-2 m.


More from this chapter

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140

Consider a quantity of a radioactive substance. The fraction of this quantity that remains after t half-lives can be found by using the expression 3–t.

A. What fraction of substance remains after 7 half-lives?


B. After how many half-lives will the fraction be of the original?

 141

One Fermi is equal to 10–15 metre. The radius of a proton is 1.3 Fermis. Write the radius of a proton in metres in standard form.

 143

Use the properties of exponents to verify that each statement is true.

A.


B.


C. 25(5n–2) = 5n

 144

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