Q. 5.68 The hall-life of oxygen- 15聽is ... [FREE SOLUTION]

Chapter 5: Q. 5.68 (page 165)

The hall-life of oxygen- $15$ is $124 s$ . If a sample of oxygen- $15$ has an activity of $4000 Bq$ , hos many minutes will elapse before it has an activity of $5000 Bq$ ? $(5, 4)$

Short Answer

Expert verified

It takes $6.2$ minutes to reach the activity of $500 B q$

Step by step solution

Step 1- Introduction

Half-life is the time it takes for half of a given radioactive material to decay. The half-life of oxygen- $15$ is said to be $124$ seconds.

Step 2- Explanation (part a)

The activity of a given oxygen sample $15$ is $4000$ becquerels.

Becquerel is a unit of radioactivity.

The symbol of Becquerel is $B q$ .

After a period of time, the activity of oxygen15 islocalid="1652171100442" $500 B q$ .

Step 3- Explanation (part b)

Calculate the number of half-lives to reach the activity of $500 B q$ , as shown below.

$4000 Bq \overset{thatfake}{鉄�} 2000 Bq \overset{2hurfive}{鉄�} 1000 Bq \overset{3hatflive}{鉄�} 500 Bq$

Therefore, three half-lives elapse before reaching the activity of $500 B q$ . The half-life is equivalent to $124 $ .$

Step 4- Explanation (part c)

Calculate the time required for the three half-lives and convert to minutes, as shown below.

3 half-lives = 3 hatf-tives 脳 \frac{124, 5}{1 hatf-ife} 脳 \frac{1 \min}{60 s}

$= 6.2 \min$

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The hall-life of oxygen- $15$ is $124 s$ . If a sample of oxygen- $15$ has an activity of $4000 Bq$ , hos many minutes will elapse before it has an activity of $5000 Bq$ ? $(5, 4)$

Short Answer

Step by step solution

Step 1- Introduction

Step 2- Explanation (part a)

Step 3- Explanation (part b)

Step 4- Explanation (part c)

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91影视

The hall-life of oxygen- 15is 124s. If a sample of oxygen- 15has an activity of 4000Bq, hos many minutes will elapse before it has an activity of 5000Bq? (5,4)

Short Answer

Step by step solution

Step 1- Introduction

Step 2- Explanation (part a)

Step 3- Explanation (part b)

Step 4- Explanation (part c)

One App. One Place for Learning.

Most popular questions from this chapter

Recommended explanations on Chemistry Textbooks

Nuclear Chemistry

Inorganic Chemistry

Chemistry Branches

The Earths Atmosphere

Kinetics

Organic Chemistry

Study anywhere. Anytime. Across all devices.

The hall-life of oxygen- $15$ is $124 s$ . If a sample of oxygen- $15$ has an activity of $4000 Bq$ , hos many minutes will elapse before it has an activity of $5000 Bq$ ? $(5, 4)$