3 years ago

How much of a radioactive kind of iodine will be left after 42 hours if the half-life is 21 hours

Mathematics

1 answer:

SOVA2 [1]3 years ago

6 0

Answer:

30 grams

Step-by-step explanation:

If the half life is 21 hours, that means after 21 hours, the initial amount will decrease to half.

So, since we started with 120 grams, it will be at 60 grams after 21 hours.

After another 21 hours have passed (after a total of 42 hours), the amount of 60 grams will split in half again to 30 grams.

So, after 42 hours, there will be 30 grams left of the radioactive iodine

You might be interested in

PLEASE HELP ME 50 POINTS!!!!<br><br> Identify an expression that is equivalent to 0.3(15y).

IgorC [24]

Answer: 4.5y

Step-by-step explanation: You have To Multiply 15 times 0.3 and you get 4.5y

7 0

3 years ago

Read 2 more answers

2.5 -5.9n - 3n +5.....?

SpyIntel [72]

-8.9n+7.5
would be your answer

8 0

3 years ago

As a person cycling increases speed, the rate of calorie burned, distance traveled, and energy expended also increase. Which of

ella [17]

Answer:

c because the distance is important

7 0

3 years ago

Given the function f(x) = x + 7 What would the input have to be so that f(x) = 15?

mr_godi [17]

Step-by-step explanation:

$\huge{\purple{\underline{\underline{\bf{\pink{Answer}}}}}}$

in this we have given the value of f(x) = 15

$f(x) = x + 7$

$f(15) = 15 + 7$

$f(15) = 22$

so this is ur answer

hope it helps .

7 0

3 years ago

In slope intercept form slope=2/7 y-intercept=0

vampirchik [111]

Answer:

y=2/7x

Step-by-step explanation:

y=mx+b where m=slope and b=y-intercept

y=2/7x+0

y=2/7x

3 0

3 years ago