1answer.
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
Elodia [21]
3 years ago
5

Iodine-131 is used medically to study the activity of the thyroid gland. Iodine – 131 has a half-life of about 8 days. This mean

s that approximately every 8 days, half the mass of the iodine decays into another element. If a container held a mass of 64 milligrams of iodine – 131, how much is left after 40 days?
Mathematics
1 answer:
Nataliya [291]3 years ago
4 0

Answer:

0.002 mg of sample will be left after 40 days.

Step-by-step explanation:

Half life of the iodine-131 =t_{\frac{1}{2}}= 8 days

Initial amount of iodine-131 =N_o= 64 milligrams = 0.064 g

Amount of iodine-131 left after the time of  40 days = N

Decay constant =\lambda = ?

\lambda =\frac{0.693}{t_{\frac{1}{2}}}=0.0866 day ^{-1}

\log[N]=\log[N_o]-\frac{\lambda \times t}{2.303}

\log[N]=\log[0.064 g]-\frac{0.0866 day^{-1}\times 40 days}{2.303}

N=Antilog [-2.6979 g]

N = 0.002004 g = 0.002 mg

0.002 mg of sample will be left after 40 days.

You might be interested in
9 + 5 = x - 11<br>how to find the x number
astra-53 [7]

9 + 5 = x - 11

combine like terms

14 = x - 11

add 11 to both sides

25 = x

or

x = 25

answer

x = 25

5 0
3 years ago
Read 2 more answers
Adar, Chi, and Melissa each left the party by themselves. In how many different orders can they leave?
borishaifa [10]

Answer:

6

Step-by-step explanation:

3*2*1

6 0
3 years ago
Label the following as either function or relation ​
Katarina [22]

I can't see anything so I'll say function. Next time add a screenshot!

Best of luck to you

4 0
3 years ago
F(x)= -1/3x+13 when value is f(-3)
almond37 [142]

Answer:

14

Step-by-step explanation:

f(x)=-1/3x+13

f(-3)=-1/3(-3)+13

f(-3)=3/3+13

f(-3)=1+13

f(-3)=14

4 0
2 years ago
Add the two questions <br><br>-6.5b + 11 and 3.3b - 2​
Viktor [21]

Answer: 5.8b

Step-by-step explanation:

8 0
3 years ago
Other questions:
  • Which mathematical statement matches the vector operation shown in the geometric representation?
    11·2 answers
  • *need help asap!*
    14·1 answer
  • Please help me !!
    6·2 answers
  • 40 pounds of dog food cost $50 how much would 35 pounds of dog food cost
    5·1 answer
  • Brian earns $11 per hour how many hours will Brian have to work until your earns $143? Plssss help me​
    9·1 answer
  • Find the volume of the cylinder
    13·1 answer
  • Assume a bank loan requires an interest payment of $85 per year and a principal payment of $1,000 at the end of the loan's eight
    13·1 answer
  • What is 3x2.7???????​
    10·1 answer
  • The two prisms below are similar. What is the value of x?
    8·2 answers
  • 10 POINTS!!: ANSWER THIS QUESTION<br> (please no bad answers)
    14·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!