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Aashish Rohilla
Subject: Physics
, asked on 19/2/18
Solve this:
Q.51. A radioactive element X with decay constant
λ
decays to a stable element Y. After how much time will the number of nuclei of X become equal to that in Y?
Answer
1
Aashish Rohilla
Subject: Physics
, asked on 19/2/18
Solve this:
Q.50. The half life of radioactive substance is 7 days. After how much time, will the number of undecayed atoms to number decayed be in ratio 1 : 7?
Answer
1
Aashish Rohilla
Subject: Physics
, asked on 19/2/18
Solve this:
Q.46. Two radioactive nuclei X and Y initially contain equal number of atoms. The life of these nuclei is 1 hour and 2 hour respectively. Calculate the ratio of their rates of disintegration after (i) two hours (ii) four hours.
Answer
1
Aashish Rohilla
Subject: Physics
, asked on 19/2/18
Solve this:
44
.
Calculate
the
binding
energy
per
nucleon
(
in
MeV
)
for
2
3
He
and
2
4
He
.
Commnt
on
difference
of
the
values
for
these
nuclei
and
its
significance
in
relation
to
α
-
decay
of
the
nuclei
.
Given
m
(
1
1
H
)
=
1
.
00783
u
m
(
1
1
n
)
=
1
.
00867
u
m
(
2
3
He
)
=
3
.
01664
and
m
(
2
4
He
)
=
4
.
00387
u
Answer
1
Aashish Rohilla
Subject: Physics
, asked on 19/2/18
Solve this:
Q.43. A radioactive sample decay rate reduces from 250000/minute to 6250/min in 5 minutes. Calculate the decay constant. Give
log
e
2
= 0.693.
Answer
1
Aashish Rohilla
Subject: Physics
, asked on 19/2/18
Solve this:
Q). The half life of a certain radioactive element is T years. State whether the half life will increase or decrease in each of the following cases
(i) the radioactive sample is subjected to a strong electric field.
(ii) the sample is buried deep under earth to subject it to tremendous pressure.
(iii) the sample is powdered to increase its surface area.
(iv) the element is made to enter into chemical combination with some other element to form a compound
Answer
3
Aashish Rohilla
Subject: Physics
, asked on 19/2/18
if n nuclear decay per second from a radioactive substance containing N nuclei what is the half life of radioactive element.
Answer
1
Aashish Rohilla
Subject: Physics
, asked on 19/2/18
the half life of a radioactive sample against beta decay is 5500 years its initial activity is found to be 15 decays per minute per gram. in how much time will its activity reduced to 10 decays per minute per gram?
Answer
1
Aashish Rohilla
Subject: Physics
, asked on 19/2/18
compute the ratio of density of nucleus to that of hydrogen atom in ground state take radius of the nucleus 1 fermi and radius of orbit of electron is 10^-10m.
Answer
1
Aashish Rohilla
Subject: Physics
, asked on 19/2/18
a heavier nuclei of an element splits up into two lighter nuclei if the process is accompanied by the release of energy which of the two parent or the daughter nuclei would have different binding energy per nucleon.
Answer
2
Ayushi Aggarwal
Subject: Physics
, asked on 18/2/18
Q7. Both choices
Why do stable nuclei never have more protons than neutrons?
OR
The decay constant, for a given radioactive sample, is 0.3465 day
-1
. What percentage of this sample will decayed in a period of 4 days?
Answer
1
Ayushi Aggarwal
Subject: Physics
, asked on 18/2/18
Q.2. Which sample, A or B shown in figure has shorter mean-life?
Answer
2
Sandra Saju
Subject: Physics
, asked on 17/2/18
Draw a graph showing the variation of binding energy per nucleon versus the mass number A. Explain with the help of this graph, the release of energy in the process of nuclear fission and fusion.
Answer
1
Pranav Shorey
Subject: Physics
, asked on 14/2/18
(a) Write the process of beta -decay. How can radioactive nuclei emit beta-particles even though they do not contain them ? Why do all electrons emitted during beta-decay not have the same energy ? (b) A heavy nucleus splits into two lighter nuclei. Which one of the two - parent nucleus or the daughter nuclei has more binding energy per nucleon ?
Answer
1
Alifa
Subject: Physics
, asked on 3/2/18
Show that excitation of the daughter nucleus Ni formed from beta^-1 decay of CO with the help of an energy level diagram. Also write the basic equation for the above process.
Answer
1
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What are you looking for?
Q.51. A radioactive element X with decay constant decays to a stable element Y. After how much time will the number of nuclei of X become equal to that in Y?
Q.50. The half life of radioactive substance is 7 days. After how much time, will the number of undecayed atoms to number decayed be in ratio 1 : 7?
Q.46. Two radioactive nuclei X and Y initially contain equal number of atoms. The life of these nuclei is 1 hour and 2 hour respectively. Calculate the ratio of their rates of disintegration after (i) two hours (ii) four hours.
Q.43. A radioactive sample decay rate reduces from 250000/minute to 6250/min in 5 minutes. Calculate the decay constant. Give = 0.693.
Q). The half life of a certain radioactive element is T years. State whether the half life will increase or decrease in each of the following cases
(i) the radioactive sample is subjected to a strong electric field.
(ii) the sample is buried deep under earth to subject it to tremendous pressure.
(iii) the sample is powdered to increase its surface area.
(iv) the element is made to enter into chemical combination with some other element to form a compound
Why do stable nuclei never have more protons than neutrons?
OR
The decay constant, for a given radioactive sample, is 0.3465 day-1. What percentage of this sample will decayed in a period of 4 days?