. How many pieces measuring 3/20 meters can be cut from a ribbon whose length is 0.75 meter
1 answer:
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Answer:
23 days.
Step-by-step explanation:
Let the original amount of radioactive material be 100.
We have been given that the half life of a radioactive material is 8 days. It is safe to feed the hay to cows when 14% of the radioactive isotope remains. We are asked to find the number of days, the farmers need to wait to use the radioactive contaminated hay.
We will use half-life formula to solve our given problem.
, where,
A = Amount left after t time,
a = Initial amount,
h = Half-life.
14% of 100 would be 14.
Now, we will take natural log of both sides.
Using natural log property , we will get:
Therefore, the farmers need to wait for 23 days.
Answer:
Option A
Step-by-step explanation:
The complete question is attached here
The rate of increase of bacterial population be K
As we know
where Y is the final population. In this case it is 1000
K is the rate of increase of population i.e 3 times per hour
T is the time in hours
Y0 is the initial population = 5
Substituting the given values, we get -
Taking log on both sides, we get -
ln = ln
T = 2.084 hours
hence, option A is correct
