answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Semmy [17]
1 year ago
11

How long will it take before twenty percent of our 1,000-gram sample of uranium-235 has decayed? [See Section 6.6 Example 13] Th

e decay equation is A(t)=A_0e^{Kt} , where t is the time for the decay, and K is the characteristic of the material. Suppose T is the time it takes for half of the unstable material in a sample of a radioactive substance to decay, called its half-life. Prove that K= \frac{ln0.5}{T} . What is T for the uranium-235? Show the steps of your reasoning.
Mathematics
1 answer:
horsena [70]1 year ago
8 0

Answer:

From what I can see of the problem, you CANNOT solve for the half-life of U 235 AND then solve for the length of time to determine the 20% decay.

U-235 half-life is 704,000,000 years. (Wikipedia)

The elapsed time formula = half-life * [log (Beginning Amount / ending amount) / log 2]

elapsed time = 7.04 x 10^8 * [log (100 % / 80%) / log 2]

elapsed time =7.04 x 10^8 *  [log (1.25) / .30103]

elapsed time =7.04 x 10^8 *  [0.096910 / .30103]

elapsed time = 7.04 x 10^8 *  0.321928047

elapsed time = 226,637,000 years

Step-by-step explanation:

You might be interested in
If secant segments SR and TR intersect at point R, find the length of VT.
CaHeK987 [17]

THANK YOUUUUUUUUU!!!

5 0
2 years ago
Read 2 more answers
Which equations represent a line that passes through the points given in the table? Check all that apply.
solong [7]

Answer:

I believe the answer is the 2nd box{y-2=1/6 (x+10)}, 3rd box{y-1=1/6(x+4)}, and the 5th box{y=1 x/6 +1/3}.

Step-by-step explanation:

5 0
1 year ago
Read 2 more answers
M(t)M, left parenthesis, t, right parenthesis models the distance (in millions of \text{km}kmstart text, k, m, end text) from Ma
lana [24]

Answer:

214

Step-by-step explanation:

5 0
2 years ago
Which graph represents y = |x|? A B C D
wariber [46]

Answer:

Step-by-step explanation:

c !!

8 0
1 year ago
Read 2 more answers
The slope of the line below is -5/7 Write the point-slope equation of the line using the coordinates of the labeled point.
Vesna [10]

Answer:

The answer is C) y - 2 = -5/7(x - 6)

Step-by-step explanation:

Since we have the slope (-5/7) and a point (6, 2), we can just input those in for m and (x1, y1) in point-slope form.

y - y1 = m(x - x1)

y - 2 = -5/7(x - 6)

4 0
2 years ago
Read 2 more answers
Other questions:
  • A food production company is choosing between two suppliers of grain. Supplier A sells grain for $5.25 per bushel plus a deliver
    13·2 answers
  • Jordan shoots 100 3-point shots per basketball practice.she makes 44 shots.what decimal represents the number of shots she makes
    12·2 answers
  • How much of a 90% alloy must be combined with 70% gold alloy in order to get 60 ounces of an 85% gold alloy?
    15·1 answer
  • Find the following angle measures.<br><br> mEAD = <br> °<br><br><br> mCAB = <br> °
    10·2 answers
  • A class has $90 to spend on a field trip. The field trip costs $2.50 per person and there will be 5 chaperones on the trip. One
    7·2 answers
  • When we make inferences about ONE POPULATION PROPORTION, what assumptions do we need to make? Mark all that apply. Group of answ
    9·1 answer
  • Semielliptical Arch Bridge An arch for a bridge over a highway is in the form of half an ellipse. The top of the arch is 20 feet
    15·1 answer
  • A box-and-whisker plot. The number line goes from 0 to 9. The whiskers range from 0 to 7, indicated by A and E. The box ranges f
    7·2 answers
  • Have you ever been frustrated because you could not get a container of some sort to release the last bit of its contents? The ar
    7·1 answer
  • A student writes an incorrect step while checking if the sum of the measures of the two remote interior angles of triangle ABC b
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!