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Question
Physics
Starting with a sample of pure 66Cu , 7/8 of it decays into Zn in 15 min . The corresponding half-life is
Q. Starting with a sample of pure
66
C
u
,
7/8
of it decays into
Z
n
in
15
min
. The corresponding half-life is
528
192
NTA Abhyas
NTA Abhyas 2022
Report Error
A
10
min
B
15
min
C
5
min
D
7
2
1
min
Solution:
N
=
N
0
(
1
−
e
−
λ
t
)
, N - The amount of substance decayed.
⇒
N
0
N
0
−
N
=
e
−
λ
t
∴
8
1
=
e
−
λ
t
⇒
8
=
e
λ
t
⇒
3
l
n
2
=
λ
t
⇒
λ
=
15
3
×
0.693
Half-life period
λ
=
5
min