Let N0 be the number of nuclei at the beginning. Number of undecayed nuclei after 33% decay = 0.67N0 Number of undecayed nuclei after 67% decay = 0.33N0 Also 0.33N0 >> 0.67N0 / 2. And in one half-life the number of undecayed nuclei becomes half.
99) Half life of a substance is 20 minutes. What is the time between 33%?decay and 67?%?decay?
Answer is:
20 minutes
Explanation:
Related Atoms and Nuclei MCQ with Answers
Answer is:
15 sec
Explanation:
use N/No=(1/2)1/T1/2 T1/2=t2 - t1 t(mean)=T1/2/0.693
Answer is:
1080
Explanation:
let' s say C disintegrates in to A and B and initialy let's say 4units of C existed .After 1620 years 1 unit of a and 0.5of B would remain and in another 810 years A will become 0.75 and B will become 0.25 which adds up to 1 which is 1 /4 OF initial amount totally 2430 years would have passed
Answer is:
gamma rays
Explanation:
gamma radiations has the least wave length?
Answer is:
density
Explanation:
As the mass number A increases, density related to a nucleus does not change