HomeworkLib
Question


3. One may assume that when U-238 was formed at the genesis of Earth, an equal amount of 235U was formed. Today the amount of

half life U-235 is 7.04x10^8 years

half life U-238 is 4.468 x10^9 years

science   chemistry   
0 0
Add a comment Improve this question Transcribed image text
Next > < Previous
Sort answers by oldest

Homework Answers

Answer #1

Answer:

Answer: dass = One) t235 d 238 = enk) t238 Also, N235 = Non è asst N238= No ēdast hence, N238 N235 = Nozzo No:35 +228 t e ē $Using these datas, we get, -dast 138 = + est > 138=et (A235-238) taking en, we get, t as, => t = en (138) (4235-2238) > t = 1

Please do give a thumbs up.

0 0
Add a comment
Know the answer?
Add Answer to:
half life U-235 is 7.04x10^8 years half life U-238 is 4.468 x10^9 years 3. One may assume that when U-238 was formed...
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. Our experts will answer your question WITHIN MINUTES for Free.
Similar Homework Help Questions

  • Problem 2(10 points): The natural composition of uranium and the half-life of the isotopes are gi...

    Problem 2(10 points): The natural composition of uranium and the half-life of the isotopes are given below in the table. Isotope |At90 Half-life (vrs) U-234 0.005% 2.455 x 10 0.711% 17.038 x 108 U-23899.284% 4.468 x 109 U-235 Assume earth was formed 4.54 x 109 years ago. The ratio of U-235 to U-238 has been steadily decreasing since than. (a) Calculate the enrichment of U-235 (in atom percent) at the time of formation of the earth (t=0) (b) Calculate the...

  • The half-life for the radioactive decay of U−238 is 4.5 billion years and is independent of...

    The half-life for the radioactive decay of U−238 is 4.5 billion years and is independent of initial concentration. How long will it take for 14 % of the U−238 atoms in a sample of U−238 to decay? If a sample of U−238 initially contained 1.4×1018 atoms and was formed 5.7 billion years ago, how many U−238 atoms does it contain today?

  • The half-life for the radioactive decay of U−238 is 4.5 billion years and is independent of...

    The half-life for the radioactive decay of U−238 is 4.5 billion years and is independent of initial concentration. 1.How long will it take for 10% of the U−238 atoms in a sample of U−238 to decay? 2.If a sample of U−238 initially contained 1.9×1018 atoms when the universe was formed 13.8 billion years ago, how many U−238 atoms will it contain today?

  • The half-life for the radioactive decay of U−238 is 4.5 billion years and is independent of...

    The half-life for the radioactive decay of U−238 is 4.5 billion years and is independent of initial concentration. a) How long will it take for 17 % of the U−238 atoms in a sample of U−238 to decay? Express your answer using two significant figures and in yrs b) If a sample of U−238 initially contained 1.8×1018 atoms and was formed 4.9 billion years ago, how many U−238 atoms does it contain today? Express your answer using two significant figures.

  • The half-life for the radioactive decay of U−238 is 4.5 billion years and is independent of...

    The half-life for the radioactive decay of U−238 is 4.5 billion years and is independent of initial concentration. Part A How long will it take for 14 % of the U−238 atoms in a sample of U−238 to decay? Express your answer using two significant figures. Part B If a sample of U−238 initially contained 1.4×1018 atoms and was formed 5.7 billion years ago, how many U−238 atoms does it contain today? Express your answer using two significant figures.

  • The half-life for the radioactive decay of U−238 is 4.5 billion years and is independent of...

    The half-life for the radioactive decay of U−238 is 4.5 billion years and is independent of initial concentration. Part A How long will it take for 20% of the U−238 atoms in a sample of U−238 to decay? Express your answer using two significant figures. Part B If a sample of U−238 initially contained 1.5×1018 atoms when the universe was formed 13.8 billion years ago, how many U−238 atoms will it contain today? Express your answer using two significant figures.

  • The half-life for the radioactive decay of U−238 is 4.5 billion years and is independent of...

    The half-life for the radioactive decay of U−238 is 4.5 billion years and is independent of initial concentration. If a sample of U−238 initially contained 1.2×1018 atoms and was formed 6.3 billion years ago, how many U−238 atoms does it contain today? Express your answer using two significant figures.

  • If a sample of U−238 initially contained 1.1×1018 atoms when the universe was formed 13.8 billion...

    If a sample of U−238 initially contained 1.1×1018 atoms when the universe was formed 13.8 billion years ago, how many U−238 atoms will it contain today? How long will it take for 10% of the U-238 atoms in a sample of U-238 to decay? Express your answer using two significant figures Constants| Periodic Table The half-life for the radioactive decay of U - 238 is 4.5 billion years and is independent of initial concentration. t- 6.8x108 yr All attempts used;...

  • One of the nuclides in spent nuclear fuel is U-235, an alpha emitter with a half-life...

    One of the nuclides in spent nuclear fuel is U-235, an alpha emitter with a half-life of 703 million years. How long would it take for the amount of U-235 to reach 1/4 of its initial amount?

  • Calculating Absolute Ages: Daughter Isotope Lead-210O Polonium-218 Xenon-131 Yttrium-90 Nitrogen-14 Uranium-235 Thorium-231 Thorium-234 Half Life [approximate]...

    Calculating Absolute Ages: Daughter Isotope Lead-210O Polonium-218 Xenon-131 Yttrium-90 Nitrogen-14 Uranium-235 Thorium-231 Thorium-234 Half Life [approximate] 0.00016 seconds 4.0 days Type of Decay Parent Isotope Polonium-214 Radon-222 lodine-131 Strontium-90 Carbon-14 Plutonium-239 Uranium-235 Uranium-238 Alpha Beta Beta Beta 8.0 da 30.0 years 5,730 years 24,000 years 704,000,000 years 4,500,000,000 years Alpha Alpha A meteorite from Mars is found on the surface of a glacier in Antarctica. You take it back to the lab and measure 96.875 grams of Thorium-231 for every...

ADVERTISEMENT
Free Homework Help App
Download From Google Play
Scan Your Homework
to Get Instant Free Answers
Need Online Homework Help?
Ask a Question
Get Answers For Free
Most questions answered within 3 hours.
ADVERTISEMENT
ADVERTISEMENT