Question

You have equal numbers of two radioactive nuclei to start with. The A nuclei have a...

You have equal numbers of two radioactive nuclei to start with. The A nuclei have a half life of 4 days, while the half life of the B nuclei is unknown. After waiting for 12 days, you find that there are twice as many B nuclei remaining as there are A nuclei. What is the half life of the B nuclei?

Science   Physics   
0 0
Add a commentTranscribed image text
Next >

Homework Answers

Answer #1

The A nuclei have gone through three half-lives. If there are now twice as many B nuclei remaining, the B nuclei must only have gone through two half-lives. Because 12 days represents two half-lives for the B nuclei, the B nuclei have a half-life of 6 days.

Imagine there are 200 nuclei of A and B at start.

After 4 day no of A nuclei =100

After 8 day no of A nuclei = 50

After 12 day no of A nuclei =25

No of B nuclei is twice of that of A

No of B nuclei = 25*2 = 50

The number of B nuclei has reduced twice. So the half life of B =12/2 = 6 days

0 0
Know the answer?
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Log In

Sign Up

Not the answer you're looking for?
Ask your own homework help question
Similar Questions
Initially a sample of radioactive nuclei of type A contains 4 times as many nuclei as...
Initially a sample of radioactive nuclei of type A contains 4 times as many nuclei as a sample B. 2 days later the samples both have the same number of nuclei. Which sample has the longer half life? Determine the half life of B if the half life of A is 0.5 days.
A sample of radioactive nuclei initially contains 6.00 ×1010×1010 radon atoms. The half-life of this type...
A sample of radioactive nuclei initially contains 6.00 ×1010×1010 radon atoms. The half-life of this type of nucleus is 500 days. How many nuclei have decayed after 167 days? A sample of radioactive nuclei initially contains 6.00  radon atoms. The half-life of this type of nucleus is 500 days. How many nuclei have decayed after 167 days? 2.00×1010 4.00×1010 1.24×1010 4.76×1010
A sample of radioactive nuclei initially contains 9.00 ×1010 radon atoms. The half-life of this type...
A sample of radioactive nuclei initially contains 9.00 ×1010 radon atoms. The half-life of this type of nucleus is 450 days. How many nuclei have decayed after 150 days? OPTIONS: 7.14×1010 6.00×1010 3.00×1010 1.86×1010
The half-life of a radioactive isotope represents the average time it would take half of a...
The half-life of a radioactive isotope represents the average time it would take half of a collection of this type of nucleus to decay. For example, you start with a sample of 1000 Oxygen-15 (15O) nuclei, which has a half-life of 122 seconds. After 122 seconds, half of the 15O nuclei will have decayed into Nitrogen-15 (15N) nuclei. After another 122s, half of the remaining Oxygen nuclei will have also decayed, and so on. Suppose you start with 4.00×103 15O...
The half-lives in two different samples, A and B, of radioactive nuclei are related according to...
The half-lives in two different samples, A and B, of radioactive nuclei are related according to T1/2,B = 1 4 T1/2,A. In a certain period the number of radioactive nuclei in sample A decreases to one-eighth the number present initially. In this same period the number of radioactive nuclei in sample B decreases to a fraction f of the number present initially. Find f.
A sealed container holds 1600 radioactive nuclei of type A. Nuclei of type A decays to...
A sealed container holds 1600 radioactive nuclei of type A. Nuclei of type A decays to a stable daughter nuclei of type B. After N half-lives, there are 1400 nuclei of type B in the container. What is the value of N? 3 0.19 5 0.62 4
The half-lives in two different samples, A and B, of radioactive nuclei are related according to...
The half-lives in two different samples, A and B, of radioactive nuclei are related according to T1/2,B = 1 6 T1/2,A. In a certain period the number of radioactive nuclei in sample A decreases to one-fourth the number present initially. In this same period the number of radioactive nuclei in sample B decreases to a fraction f of the number present initially. Find f. (its not 1/3.. its not 0.917... and its not .875) Please answer to 4 decimal places
You have 89.165g of a radioactive element with a half-life of 59.65minutes. After 285.9 minutes have...
You have 89.165g of a radioactive element with a half-life of 59.65minutes. After 285.9 minutes have passed, how many grams of the radioactive element remain? Report your answer to 2 decimal places.
Radioactive Half-life Years Element A Remaining Radioactive Atoms Element B Remaining Radioactive Atoms Element C Remaining...
Radioactive Half-life Years Element A Remaining Radioactive Atoms Element B Remaining Radioactive Atoms Element C Remaining Radioactive Atoms Element D remaining Radioactive Atoms 0              100 100 100 100 1000 50 85 90 95 2000 25 72 81 90 3000 13 61 73 86 4000 6 52 66 81 5000 3 44 59 77 6000 2 38 53 74 7000 1 32 48 70 8000 0 27 43 66 9000 0 23 39 63 10000 0 20 35 60 11000...
A radioactive sample contains 2.94 μg of pure11C, which has a half-life of 20.4 min. a)...
A radioactive sample contains 2.94 μg of pure11C, which has a half-life of 20.4 min. a) How many moles of 11C is present ini- tially? The value of Avogadro’s number is 6.02 × 1023 nuclei/mol. Answer in units of mol. b) Find the number of nuclei present initially. Answer in units of nuclei. c)Find the initial activity of the sample. Answer in units of Bq. d)Find the activity of the sample after 6.97 h. Answer in units of Bq.
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT