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Syllabus

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

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?

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

11. The work functions of three metals A, B and C are W

_{A,}W_{B}and W_{C}respectively. They are in the decreasing order. The correct graph between kinetic energy and frequency V of incident radiation is.12. The energy released during the fission of 1 kg of U

^{235}is E_{1}and the produced during the fusion of 1 kg of hydrogen is E_{2}. If energy released per fission of uranium-235 is 200 MeV and that per fusion of hydrogen is 24.7 MeV. then the ratio $\frac{{E}_{2}}{{E}_{1}}$ is.(a) 2 (b) 7

(c) 10 (d) 20

What is proton-neuron hypothesis of nuclear composition?

1.e/m

2.2e/m

3.e/2m

4.e/4m

show that density of nucleons is independent to mass number.

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

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

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

Find out its half life and initial activity.

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

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 ?

Q No: 15There are two radioactive substances A and B. Decay constant of B is two times that of A. Initially both have equal number of nuclei. After n half lives of A rate of disintegration of both are equal. The value of n is :- (1) 1 (2) 2 (3) 4 (4) All of these

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

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

Ans: 19%Please explain Davisson aand Germer experiment ... And state it's importance.

determined? Write the relation between the radius

and mass number of the nucleus Show that

density of nucleus is independent of its mass

number.

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.

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

Explain the working of nuclear reactor?

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

What is the mass of one curie U-234?

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

(1) 3 × 10

^{8}K (2) 3 × 10^{9}K (3) 2 × 10^{8}K (4) 3 × 10^{7}Ka) Inner orbits of atoms

b) Free electron existing in nucleus

c) Decay of neutron in the nucleus

d) Photon escaping from the nucleus

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%?

a ) alpha , beta , gamma b ) alpha , gamma , beta c ) beta , gamma , alpha d ) gamma , beta , alpha α α α

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

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 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.$\left(A\right)6000\phantom{\rule{0ex}{0ex}}\left(B\right)9000\phantom{\rule{0ex}{0ex}}\left(C\right)3000\phantom{\rule{0ex}{0ex}}\left(D\right)24000$

wats the difference b/w nucleus and nucleon

^{-27}kg. calculate the mass of 1 atom of C^{12}in kg.(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.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?

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

why is the energy distribution of beta rays continuous?

redioactive rays was invented by.

what are coolants?give an example.

^{16}_{8}O in MeV/c^{2}.Q.8. A neutron with an energy of 4.6 MeV collides with stationary protons elastically. Assuming that upon each collision the neutron is deflected, on an average by 45$\xb0$, the number of successive collisions which will reduce its energy to 0.23 eV, is

(1) 25

(2) 24

(3) 21

(4) 22

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.

Q. A radioactive element X disintegrates to form Y. At any instant t, the ratio of number of atoms of X and Y are respectively 1 : 15. If initially there is no and half life period of X is 15 years. then t in years is

(1) 70

(2) 50

(3) 60

(4) 40

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?

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

Hello! my question is -

What is the law of radioactive decay ?

and

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

Please answer the given question

A nucleus makes a transition from one permitted energy level to another level of lower energy .

name the region of the electromagnetic spectrum to which the emitted photon belongs.What is the order of its energy in electron volts??

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??

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

why proton to neutron decay is possible only inside nucleus?

1.a nucleus of 4

2He.

2.a nucleus of 238

92 U

3.what is the ratio of these raddi..

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}Po

84

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

Explain beta-minus decay and beta-plus decay ?

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

(1) $\frac{3}{16}$

(2) $\frac{13}{15}$

(3) $\frac{7}{15}$

(4) $\frac{5}{13}$

features of binding energy curve?