A radioactive element decays by the sequence, and with half-lives, given below
Which of the following statements about this system are correct?
a)
After two hours, less than 10% of the initial 
is left
b)
Maximum amount of 
present at any time before 30 min is less then 50% of the initial amount of 
c)
Atomic numbers of 
and 
are same
d)
All of the above are correct statements
A radioactive element decays by the sequence, and with half-lives, given below
Which of the following statements about this system are correct?
a)
After two hours, less than 10% of the initial is left
b)
Maximum amount of present at any time before 30 min is less then 50% of the initial amount of
c)
Atomic numbers of and are same
d)
All of the above are correct statements
Question ID - 101443 | SaraNextGen Top Answer
A radioactive element decays by the sequence, and with half-lives, given below
Which of the following statements about this system are correct?
a)
After two hours, less than 10% of the initial is left
b)
Maximum amount of present at any time before 30 min is less then 50% of the initial amount of
c)
Atomic numbers of and are same
d)
All of the above are correct statements
|
A radioactive element decays by the sequence, and with half-lives, given below
Which of the following statements about this system are correct? |
|
|
a) |
After two hours, less than 10% of the initial |
|
b) |
Maximum amount of |
|
c) |
Atomic numbers of |
|
d) |
All of the above are correct statements |
|
(d)
Half-life period of Total time
Thus, (a) is true Before 30 min ( = half-life) amount of Hence, (since half-life of Thus, (b) is correct
|
is atomic number of 
number of half-lives 
left after 4 half-lives 
left > 50%
formed < 50%
) is 2880 min >> half-life of 
)
and 
are isotopes with same atomic number 
thus, (c) is correct