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Syllabus

define activity of a radioactive material and write its si units draw graph for activity vs time ?

CALCULATE THE BINDING ENERGY OF AN ALPHA PARTICLE

The mass of 2 protons = 2 x 1.007825 amu

The mass of 2 neutrons = 2 x 1.008665 amu

Total Mass = 4.032981 amu

The actual mass, as measured by a mass spectrometer, is 4.002800 amu.

Delta m = 4.032981-4.002800 = 0.030180

NOW,

Binding energy = 0.030180 * 931 = 28.097 Which is the answer,,,,

BUT,

The Formua to find B.E is delta m . c^2

so the ans should be like this ,

= 0.030180 * (3*10^8)^2.... am I right ?

What is proton-neuron hypothesis of nuclear composition?

In an atom, two electrons moves around the nucleus in circular orbit of radius R and

A

^{240}→ B^{100}+ C^{140}+ Q_{(energy) }Let binding energy per nucleon of nucleus A, B and C is 7.6 MeV, 8.1 MeV and 8.1 MeV respectively. Value of Q is : - (Approximately)

(1) 20 MeV (2) 220 MeV (3) 120 MeV (4) 240 MeV

show that density of nucleons is independent to mass number.

Q.48. Ratio of initial active nuclei in two different samples is 2 : 3. Their half lives are one hour and two hours respectively. Ratio of active nuclei at the end of 6 hours will be:-

(1) 1 : 1

(2) 1 : 12

(3) 4 : 3

(4) 3 : 4

1amu = 931 Mev .......how do we prove this?

Two nuclei have mass numbers in the ratio 1:8. what is the ratio of their nuclear radii?

compare the radii of two nuclei with mass numbers 1 and 27 respectively

(dps) after 20 hours. After next 10 hours its activity reduces to 5,000 dps.

Find out its half life and initial activity.

Please explain Davisson aand Germer experiment ... And state it's importance.

Prove that the instantaneous rate of change of activity of a radio-active substance is inversely proportional to the square of its half life.

Q. Two radioactive sources A and B initially contain equal number of radioactive atoms. Source A has a half-life of 1 hour and source B has a half-life of 2 hours. At the end of 2 hours, the ratio of the rate of disintegration of A to that of B is :

the radioactive nuclei X and Y initially contain equal number of atoms. Their half lives are 1 hour and 2 hour respectively. Compare he rate of their disintegration after two hours.

Explain the working of nuclear reactor?

Light with an energy flux of 18W/cm

^{2}falls on a non-reflecting surface at normal incidence. If the surface has an area of 20cm^{2}, find the average force exerted on the surface during a 30 min time span.^{238}_{92}U undergoing alpha decay is 4.5 * 10^{9}years. What is the activity of 1g sample of^{238}_{92}U ?A nucleus of mass 220 amu in free state decays to emit an alpha particle. Kinetic energy of the alpha particle emitted is 5.4 MeV. The recoil energy of the daughter nucleus is

1)why is the binding energy constant btw 30 qnd 170?

2)what is meant by saturation property of nuclear forces?

3)explain how the potential energy vs radius graph is drawn like this

characteristic feature of nuclear force which distinguish it from columb force ?

Explain the concept of de Broglie wave (matter wave).....

Q (a) Draw the energy level diagram showing the emission of beta particles followed by gamma rays by a Co ( Z=27 A=60 ) nucleus.

(b) Plot the distribution of kinetic energy of beta particles and state why the energy spectrum is continuous.

Part (b) is my doubt.

A radioactive isotope has a half life of 5 years. How long will it take the activity to reduce to 3.125%?

accidently some radioactive material (half-life 10 days) spreads in a room. tests show that the level of radiation is 32 times the permissible level. after how many days can the room be safe for living

From the relation

R=R_{0}A^{1}/^{3}, whereR_{0}is a constant andAis the mass number of a nucleus, show that the nuclear matter density is nearly constant (i.e. independent ofA).Obtain approximately the ratio of the nuclear radii of the gold isotope and the silver isotope.

^{16}_{8}O in MeV/c^{2}.wats the difference b/w nucleus and nucleon

A radioactive sample at any instant has its disintegration rate 5000/min. After 5 mins the rate is 1250/min. Find the decay constant in per minute.^{-27}kg. calculate the mass of 1 atom of C^{12}in kg.5. An alpha particle having kinetic energy of 10 MeV is moving towards a stationary nucleus of atomic number 50. The distance of closest approach will be.

(a) 1.44 x 10

^{-15}m (b) 1.44 x 10^{-15}m(c) 1.44 x 10

^{-13}m (d) 14.4 x 10^{-16}mwhy is the energy distribution of beta rays continuous?

A radioactive isotope has a half life T years. After how much time its ativity reduced to 6.25% of its original activity?

the half-life of a radioactive substance is 30 days. what time will it take for(3/4)th of its original mass to disintegrate?

(a) Plot the graph of R versus t and calculate half life from the graph.

(b) Plot the graph of In (R/R

_{0}) versus t and obtain the value of half life from the graph.h= 6.62 × 10^{–34}Js.a) decay constant and

b) half-life of the radioactine substance.

Two nuclei have mass numbers in the ratio 1:2. What is the ratio of their nuclear densities?

A heavy nucleus X of mass no. 240 and binding energy per nucleon is 7.6 Mev is split into Y and Z of mass no. 110 and 130. the binding energy of nucleons in Y & Z is 8.5 Mev per nucleon. calculate the energy released per fission in Mev.

Ans: 19%Find ratio of maximum wavelength of lyman series in hydrogen spectrum to the maximum wavelength in pa

4 nuclei of an element fuse together to form a heavier nucleus. if the process is accompanied by release of energy, which of the two- the parent or the daughter nucleus would have higher binding energy per nucleon?

a. ${}_{8}O^{19}\to {}_{9}F^{19}+{}_{-1}e^{0}+\overline{)\overline{)v}}$

Given

m (${}_{8}O^{19}$) = 19.003576 a.m.u.

m (${}_{9}F^{19}$) = 18.998403 a.m.u.

m (${e}^{0}$) = 0.000549 a.m.u.

explain the expression for nuclear binding energy when mass defect is measured in amu

Q. Half life of a radio activity element is 5 min. 10 sec. Time taken for 90% of it to disintegrate is nearly.

1) 100 min 2) 1000 sec 3) 10

^{4}sec 4) 10^{4}min.Q18. A radioactive element

_{90}X^{238} decays into_{ }_{83}Y^{222}, then the number of $\mathrm{\beta}$ - particles emitted are(1) 1 (2) 2

(3) 4 (4) 6

Explain how radioactive nuclei can emit beta particles even though atomic nuclei do not contain these particles. hence xplain why the mass no. of a radioactive nuclie does not change during beta decay?

Q.65. 10.24 g radioactive substance has half life 3.8 days. After 19 days, its remaining quantity is :-

(1) 0.151 g

(2) 0.32 g

(3) 1.51 g

(4) 0.16 g

Hello! my question is -

What is the law of radioactive decay ?

and

derive the relationship betwen half life period and the disintegration constant.

1.a nucleus of 4

2He.

2.a nucleus of 238

92 U

3.what is the ratio of these raddi..

Tritium has a half life of 12.5 years against beta decay .What fraction of sample of pure tritium will remain undecayed after 25 years??

The

Qvalue of a nuclear reactionA+b→C+dis defined byQ= [m_{A}+m_{b}−m_{C}−m_{d}]c^{2 }where the masses refer to the respective nuclei. Determine from the given data theQ-value of the following reactions and state whether the reactions are exothermic or endothermic.(i)

(ii)

Atomic masses are given to be

why proton to neutron decay is possible only inside nucleus?

Explain beta-minus decay and beta-plus decay ?

Q. It is found tha if a neutron suffers an elastic - collinear collision with deuterium at rest, fractional loss of its energy is P

_{c}. The values of P_{d}and P_{c}are respectively:(1) (0,1)

(2) (.89, .28)

(3) (.28, .89)

(4) (0,0)

the mass of nucleus in its ground state is always less than the total mass of it's constituents-neutrons and protons.Explain

what is the approximate energy released by the complete annihillation of an alpha particle?

features of binding energy curve?

WHEN FOUR HYDROGEN NUCLEI COMBINE TO FORM A HELIUM NUCLEUS, ESTIMATE THE AMOUNT OF ENERGY IN MeV RELEASED IN THIS PROCESS OF FUSION.

MASS OF PROTON: 1.007825u

MASS OF HELIUM NUCLEUS: 4.002603u

1u= 931 MeV/c

^{2}A radioactive nucleus ‘A’ undergoes a series of decays according to the following scheme:

The mass number and atomic number of A are 180 and 72 respectively. What are these numbers for A

_{4}?A has mass number as 180 and atomic number 172.

Formation of A

_{1}by α-decay:Formation of A

_{2}byβdecay:Formation of A

_{4}:In

r-decay, mass number and atomic number remain the same.Thus,

Mass number of A

_{4}= 172Atomic number of A

_{4} = 169_{6}^{14 }is 5700 years.What does it mean?Two radioactive nuclei X and Y initially contain an equal no. of atoms.Their half lives are 1hr and 2hr.Calculate ratio of their rates of disintegrations after 2hoursWhat are

positrons??