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Syllabus

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

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.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 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

show that density of nucleons is independent to mass number.

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 ?

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

Explain the graph of packing fraction versus mass number.Two nuclei have mass numbers in the ratio 1:8. what is the ratio of their nuclear radii?

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

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

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.

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}mthe 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.

h= 6.62 × 10^{–34}Js.Explain the working of nuclear reactor?

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

^{238}_{92}U undergoing alpha decay is 4.5 * 10^{9}years. What is the activity of 1g sample of^{238}_{92}U ?a) decay constant and

b) half-life of the radioactine substance.

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

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

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

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)

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

Find out its half life and initial activity.

^{16}_{8}O in MeV/c^{2}.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.

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).A radioactive isotope has a half-life of

Tyears. How long will it take the activity to reduce to a) 3.125%, b) 1% of its original value?A radioactive isotope has a half life of 5 years. How long will it take the activity to reduce to 3.125%?

Find ratio of maximum wavelength of lyman series in hydrogen spectrum to the maximum wavelength in pa

wats the difference b/w nucleus and nucleon

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 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.Po

84

originally at rest emit alpha particle with speed v .What is the recoil speed of the daughter nucleus?

i) State the condition undert which the phenomenon of resonance occurs in a series LCR circuit.

ii) Plot a graph showing variation of current with frequency of ac source in a series LCR circuit.

iii) At resonance what is the value of power factor in the case of LCR series circuit ?

why is the energy distribution of beta rays continuous?

Half life of a radioactive substance is 20 days. What percentage of the sample will deacy in 10 days?

(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.Please explain these :-

(1)Thermionic emission

(2) Photoelectric emission

(3) Field emission

(4) Secondary emission

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?

_{0}A^{1/3}where R_{0 }is constant and A is the mass number of the nucleus, show that nuclear matter density is independent of AA 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.

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

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) Inner orbits of atoms

b) Free electron existing in nucleus

c) Decay of neutron in the nucleus

d) Photon escaping from the nucleus

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

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?

nucleus. Given m Ca = 39.962589u mp=1.0078u mn=1.00867u

.Take l amu= 931MeV

Hello! my question is -

What is the law of radioactive decay ?

and

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

features of binding energy curve?

half life of a radioactive substance is 10 days if originally 100mg of the substance was present what will be activity of the substance after 5 days

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??

a)7.6 Mev

b)56.12 Mev

c)10.24 Mev

d)23.4 Mev

Explain beta-minus decay and beta-plus decay ?

why proton to neutron decay is possible only inside nucleus?

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

how much energy is required to break c12 nucleus into 3 alpha particles? the atomic mass of c12 is 12amu and mass of an alpha particle is 4.002603a.m.u.

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

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} = 169The decay constant for a given radionuclide has a value of 1.386 day^-1 . Aftef how much time will a given sample of this radionuclide get refuced to 6.25% of its present number .

Here is it possible to use both formulae ( R=R0 e raised to -lambda t ) and R/R0 = (12)^n

What are

positrons??