Question

a
20. The half life of
years. The time
a.
alf life of radioactive material is 1200
re The time in which it reduces to 12.5% of
initial count is
a. 4800 years
b. 3600 years
C. 600 years
d. 300 years​

Answer 1

Answer:

$final \: = initia( { \frac{1}{2}) }^{ \frac{t}{t .\: half} } \\ 12.5 = 100( { \frac{1}{2} )}^{ \frac{t}{1200} } \\ { (\frac{1}{2}) }^{3} = { (\frac{1}{2}) }^{ \frac{t}{1200} } \\ t \: = 4800years$

hope the answer will help you

Explanation:

a. is the correct answer

Answer 2

Answer:

final=initia(

2

1

)

t.half

t

12.5=100(

2

1

)

1200

t

(

2

1

)

3

=(

2

1

)

1200

t

t=4800years

hope the answer will help you

Explanation:

a. is the correct answer