Solution:
Half life time (t1/2) is related with total time (T) as,
T = n x t1/2
n = T / (t1/2)
n = 48 days / 8 days = 6
According to radioactivity equation:
N = No x (1/2)^n
Where, N = left amount
No = initial amount
Hence,
N = 1.8 kg x (1/2)^6
N = 1800 g x (1/64)
N = 28.125 g
Hence, the remained amount of I-131
= 28.125 g
The I131 nuclide has a halflife of 8.0 days. If you originally have a 1.8kg sample,...
The
decay curve of a radioactive nuclide sample is shown. Its initial
activity is measured to be X Bq.
14. What is the population at t=8.0
15. After how many half lives will the population be 125
nuclides?
16. What will be the level of activity (in terms of X) after
two half lives have elapsed?
17. What would the activity of the above sample be if we
tripled its size?
18. If the initial activity of 0.356 grams of...
19.
What will the mass of nuclide X be after 24 hours have elapsed?
20. What will the mass of nuclide Y be after 24 hours have
elapsed?
21. What will the mass of the sealed container be after 24
hours have elapsed?
A radioactive nuclide X having a mass of 65.0 grams is sealed in a container having a mass of 5.00 grams. The nuclide X decays into the nuclide Y. The nuclide X has a half life of...
The
following question is about the fundamental forces.
13. List the four force interactions in the universe (in order
from strongest to weakest)
The decay curve of a radioactive nuclide sample is shown. It’s
initial activity Is measured to be X Bq.
14. What is the population at t=8.0 hours?
15. After how many half lives will the population be 125
nuclides
16. What will be the level of activity (in terms of X) after
two half lives have elapsed?...
A
radioactive nuclide X having a mass of 65.0 grams is sealed in a
container having a mass of. 5.00 grams. The nuclide X decays into
the nuclide Y. The nuclide X has a half life of 6.00 hours.
19. What will the mass of nuclide Y be after 24 hours have
elapsed?
20. What will the mass of nuclide Y be after 24 hours have
elapsed?
21. What will the mass of the sealed container be after 24
hours...
16.
What will he the level of activity (in terms of X) after two half
lives have elapsed?
17. What would the activity of a the above sample be if we
tripled its size?
18. If the initial activity of 0.365 grams of the above sample
is Y Bq, what would the activity be if we increased the initial
sample to 0.950 grams?
The decay curve of a radioactive nuclide 1000 sample is shown. Its initial activity is measured to...
Phosphorus-32 has a half-life of 14.3 days. How many grams remain from a 10 gram sample after 13 days? Click here for a copy of Final Exam cover sheet.
Questions 1-4
1.Calculate the mass defect and the binding energy/nucleon of the nuclide Be, which has a mass of 9.012 182 24 amu. The mass of a proton is 1.007 276 47 amu and the mass of a neutron is 1.008 664 90. One amu - 1.6605 x 10 kg and the speed of light is 3.00 x 10 m/s. 2. Write the nuclear equation for each of the following reactions. Refer to a periodic table. a. the alpha decay...
Consider a 15.60g sample of 131I, which has a half-life of 8.02 days. a. How much of the sample (in grams) will remain after 16.04 days? b. How much of the sample will remain after 16.04 hours?
A certain radioactive nuclide has a half life of 50.7 years. How long does it take for 87.5% of a sample of this substance to decay? years Submit Hide Hints Hint 1 Hint 4 Hint 3 Hint 2 What percentage of the original sample has decayed after two half lives have elapsed?
8. The nuclide 76 As has a half-life of 26.0 hrs. If a sample of "As weighs 344g, what mass 7As remains after 538 mins? a) b) c) d) 84g 157g 271g 365g