WORD PROBLMS 1 Zika virus doubles itself in 72hrs How long i

WORD PROBLMS:

1. Zika virus doubles itself in 72hrs. How long it will take to quadruple?

2. What is the effective rate of interest on a loan at 0.5% every two weeks?

3. 1/2 life of radium is 34,000 years. How long it will take to radiate 10%?

Solution

1) Zika virus doubles itself in 72hrs ======> It will quadruple = 72*2 = 144 hrs

3) decay constant = 0.693/34000 = 2.04*10^-5

0.10 = e^(-2.04*10^-5*t)

t = 112871.8 years