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Standard XII
Chemistry
Energetics of Nuclear Fission
The disintegr...
Question
The disintegration rate of a certain radioactive sample at any instant is
4750
dpm. Five minutes later, the rate becomes
2700
dpm. Calculate half life of sample.
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Solution
R
o
=
4750
dpm
t
=
5
min
R
=
2700
dpm
t
1
/
2
=
?
5
=
2.303
×
t
1
/
2
0.693
×
l
o
g
(
4750
2700
)
t
1
/
2
=
6.13
min
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0
Similar questions
Q.
The disintegration rate of a certain radioactive sample at any instant is 4750 dpm (disintegration per minute). Five minutes later, the rate becomes 2700 dpm. Calculate half-life of sample.
Q.
The disintegration rate of a certain radioactive sample at any instant is 4750 dpm. Five minutes later, the rate becomes 2700 dpm. The half life of sample is :
Q.
A radioactive sample at any instant has its disintegration rate
5000
disintegration per minute. After
5
minutes, the rate is
1250
disintegrations per minute. Then, the decay constant, per minute, is
Q.
A counter rate meter is used to measure the activity of a radioactive sample. At a certain instant, the count rate was recorded as
475
counters per minute. Five minutes later, the count rate recorded was
270
counts per minute. Calculate the decay constant and half life period of the sample.
Q.
A count rate meter is used to measure the activity of a given sample. At one instant, the meter shows 4750 counts per minute. Five minutes later, it shows 2700 counts per minute. Find (a) the decay constant and (b) the half-life of the sample.
(
l
o
g
10
1.760
=
0.2455
)
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