Answer:
1. a) 0.5 h = 1,800 s
h) 20 cm = 0.2 m
b) 2.0 h = 7,200 s
i) 5.0 kg = 5,000 g
c) 3.5 h = 12,600 s
j) 1.5 kg = 1,500 g
d) 1/4 h = 900 s
k) 450.0 g = 0.45 kg
e) 3.0 m = 300 cm
l) 20.0 g = 0.02 kg
f) 2.5 m = 250 cm
m) 500.0 g = 0.5 kg
g) 0.5 m = 500 mm
n) 1000.0 g = 1 kg
Answer:
Thus the time taken is calculated as 387.69 years
Solution:
As per the question:
Half life of = 28.5 yrs
Now,
To calculate the time, t in which the 99.99% of the release in the reactor:
By using the formula:
where
N = No. of nuclei left after time t
= No. of nuclei initially started with
(Since, 100% - 99.99% = 0.01%)
Thus
Taking log on both the sides:
t = 387.69 yrs