Decay rate for Radium-228 is 0.01205
Step-by-step explanation:
The half life of radium-228 is 5.75 years. We need to find the decay rate for radium.
The formula used is:

Where N₀ = amount of radioactive particles at time = 0
N_t = amount of radioactive particles are time (t)
λ = rate of decay constant
t = time
We are given half life so,
=0.5
t= 5.75 years
We need to find λ
Putting values in formula and solving:


So, Decay rate for Radium-228 is 0.01205.
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97.07%
Step-by-step explanation:
total number of students is
696+21=717
696/717×100=97.07
answer is 97.07%
Answer:
76
Step-by-step explanation:
7+0.2+0.4=7.6
7.6 times 10 is 76
4/9
= 0.44444444
= Rounded to 0.44
The correct answer is 0.44