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Class 12
Physics
Modern Physics
Nuclei
Which among the three causes the least biological damage externally?
Solution:
Among
γ
,
α
and
β
radiation, alpha
(
α
)
radiation uses the least biological damage externally.
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solid and semiconductor devices
nuclear physics
electrons and photons
atomic physics
nuclei
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solid and semiconductor devices
nuclear physics
electrons and photons
atomic physics
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Why does the radiation C deflect more than A?
A piece of wood from the ruins of an ancient building was found to have a
C
1
4
activity of
1
2
disintegration per minute per gram of its carbon content. The
C
1
4
activity of the living wood is
1
6
disintegration per minute per gram. How long ago did the tree, from which the wooden sample came, di? Given half-life of
C
1
4
is
5
7
6
0
years.
In an ore containing uranium, the ratio of
U
2
3
8
to
P
b
2
0
6
is
3
. Calculate the age of the ore, assuming that all the leas present in the ore is the final stable product of
U
2
3
8
. Take the half-life of
U
2
3
8
to be
4
.
5
×
1
0
9
yr.
The normal activity of living carbon-containing matter is found to be about 15 decays per minute for every gram of carbon. This activity arises from the small proportion of radioactive
6
1
4
C
present with the stable carbon isotope
6
1
2
C
. When the organism is dead, its interaction with the atmosphere (which maintains the above equilibrium activity) ceases and its activity begins to drop. From the known half-life ( 5730 years) of
6
1
4
C
, and the measured activity, the age of the specimen can be approximately estimated. This is the principle of
6
1
4
C
dating used in archaeology. Suppose a specimen from Mohenjodaro gives an activity of 9 decays per minute per gram of carbon. Estimate the approximate age of the Indus-Valley civilisation.
When charcoal is prepared from a living tree, it shows a disintegration rate of 15.3 disintegration of
1
4
C
per gram per minute. A sample from an ancient piece of charcoal shows .
1
4
C
activity to be 12.3 disintegration per gram per minute . how old is this sample? half-life of
1
4
C
is 5730 y.
A pieces of bone an animals from a ruin is found to have
1
4
C
activity of 12 disintegrations per minute per gm of its carbon content. The
1
4
C
activity of of a living animal is 16 disintegration per minute per gm How long ago nearly did the animal die?
(Given half of life
1
4
C
is
t
1
/
2
=5760 years)
Carbon
1
4
dating is used to estimate the age of an archeological specimen.
Name the radiation which is used in carbon dating.
Why does the radiation C deflect more than A?
A piece of wood from the ruins of an ancient building was found to have a
C
1
4
activity of
1
2
disintegration per minute per gram of its carbon content. The
C
1
4
activity of the living wood is
1
6
disintegration per minute per gram. How long ago did the tree, from which the wooden sample came, di? Given half-life of
C
1
4
is
5
7
6
0
years.
In an ore containing uranium, the ratio of
U
2
3
8
to
P
b
2
0
6
is
3
. Calculate the age of the ore, assuming that all the leas present in the ore is the final stable product of
U
2
3
8
. Take the half-life of
U
2
3
8
to be
4
.
5
×
1
0
9
yr.
The normal activity of living carbon-containing matter is found to be about 15 decays per minute for every gram of carbon. This activity arises from the small proportion of radioactive
6
1
4
C
present with the stable carbon isotope
6
1
2
C
. When the organism is dead, its interaction with the atmosphere (which maintains the above equilibrium activity) ceases and its activity begins to drop. From the known half-life ( 5730 years) of
6
1
4
C
, and the measured activity, the age of the specimen can be approximately estimated. This is the principle of
6
1
4
C
dating used in archaeology. Suppose a specimen from Mohenjodaro gives an activity of 9 decays per minute per gram of carbon. Estimate the approximate age of the Indus-Valley civilisation.
When charcoal is prepared from a living tree, it shows a disintegration rate of 15.3 disintegration of
1
4
C
per gram per minute. A sample from an ancient piece of charcoal shows .
1
4
C
activity to be 12.3 disintegration per gram per minute . how old is this sample? half-life of
1
4
C
is 5730 y.
A pieces of bone an animals from a ruin is found to have
1
4
C
activity of 12 disintegrations per minute per gm of its carbon content. The
1
4
C
activity of of a living animal is 16 disintegration per minute per gm How long ago nearly did the animal die?
(Given half of life
1
4
C
is
t
1
/
2
=5760 years)
Carbon
1
4
dating is used to estimate the age of an archeological specimen.
Name the radiation which is used in carbon dating.
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