8 months ago

The half-life of lead is 18 years. How long will it take for the sample of this substance to decay to 15%?a. Find your k

Mathematics

1 answer:

ipn [44]8 months ago

7 0

Solution

We are given

Half Life = 18 years

To solve for k

$\begin{gathered} 0.5=e^{-18k} \\ ln(0.5)=-18k \\ k=-\frac{ln(0.5)}{18} \\ k=0.0385081767 \end{gathered}$

You might be interested in

The table shows the amount of flour

nadya68 [22]

Answer:

⅛ cups per waffle

Step-by-step explanation:

4 0

2 years ago

Evaluate the following a) 4!= b) 0!= c) 2! + 3!= d) 3! x 4! e) 10! / 7!

IRISSAK [1]

Answer:

See below for answers and explanations

Step-by-step explanation:

4! = 4*3*2*1 = 24

0! = 1

2! + 3! = 2*1 + 3*2*1 = 2 + 6 = 8

3! * 4! = 3*2*1 * 4*3*2*1 = 6 * 24 = 144

10! / 7! = 10*9*8*7*6*5*4*3*2*1 / 7*6*5*4*3*2*1 = 10*9*8 / 1 = 720

6 0

1 year ago

A middle school student studies the amount of time seventh and eighth graders spend playing video games on the weekend by collec

lesya692 [45]

Yes, the student's theory is correct, because the survey shows that the seventh graders spend more time playing games on the weekend than the eighth graders.

4 0

3 years ago

Read 2 more answers

Connor believed that he did not do well in his ABC physics test. All ABC physics test scores are normally distributed with a mea

jenyasd209 [6]

Answer:

Yes! he passed

Step-by-step explanation:

8 0

2 years ago

W+3 3/8 =1 5/6= I know the answer but i want to see if you get it

nasty-shy [4]

Answer:

...

Step-by-step explanation:

7 0

2 years ago

Read 2 more answers