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define activity of a radioactive material and write its si units draw graph for activity vs time ?
Light with an energy flux of 18W/cm2 falls on a non-reflecting surface at normal incidence. If the surface has an area of 20cm2, 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
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?
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.
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?
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.
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
the relation R
is a constant and A
the mass number of a nucleus, show that the nuclear matter density is
nearly constant (i.e. independent of A).
radioactive isotope has a half-life of T
years. How long will it take the
activity to reduce to a) 3.125%, b) 1% of its original value?
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/c2
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.
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?
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 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?
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?
Hello! my question is -
What is the law of radioactive decay ?
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??
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 A4?
A has mass number as 180 and atomic number 172.
Formation of A1 by α-decay:
Formation of A2 by β decay:
Formation of A4:
In r-decay, mass number and atomic number remain the same.
Mass number of A4 = 172
Atomic number of A4 = 169
What are positrons??
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