At some time (t = 0) mas of a Radon (Rn) [atomic number 86 and atomic mass number 222] sample is 0.38 µg. Half-life of Radon is 3.8235 days. Avogadro’s number = 6.02 x 1023. (a) Determine the initial number of nuclei in the sample
(b) Determine the initial activity of the sample
(c) Determine the number of nuclei present in the sample after 5.0 h

the answer is a 3.8cm

explanation:

answer: at 24 february, 2014 the population gets twice of its initial population.

explanation:

since we have given that

the population for alpha city, t years after january 1, 2004 is given as

first we find out the initial population, i.e. t=0,

so, our quadratic equation becomes,

according to question, we have said that if the population has twice its initial population, then it becomes

so, time taken to reach this above mentioned population is given by

now, we know that time can't be negative so, we take t=9.149 years.

hence, at 24 february, 2014 the population gets twice of its initial population.

conduction, convection, radiation