5-Mark Questions
Q1) Explain how radioactive nucei can emit beta particles even though atomic nuclei do not contain these particles.hence explain why the mass numbers of a radioactive nuclide does not change during beta decay.Use the basic law of radioactive decay to show that radiactive nuclei follow an exponential decay law.Hence obtain a formula,for the half-life of a radioactive nuclide,in terms of its disintegration constant. [DELHI 2004C]
Q2)Draw a labelled diagram for alpha particle scattering experiment.Give Rutherford's observation and discuss the significance of this experiment.Obtain The expression which helps us to get an idea of the size of a nucleus ,using these observation.[FOREIGN 2003]
Q3)Draw the graph to show variation of binding energy per nucleon with mass number of different nuclei.Calculate binding energy per nucleon of Ca nucleus.
Given : mass of Ca = 39.962589 u
mass of proton = 1.007825 u
mass of neutron = 1.008665 u
1 atomic mass unit(u) = 931 MeV [DELHI 2002]
Q4) a)Define the termdecay constant and half-life of a radioactive sample.Derive the relation connecting the two.
b)How many disintegration per second will occur in one garm of Uranium (at.no: 92,Mass no. :238),if its half life against alpha decay is 1.42x10^17 s?[DELHI 2001]
Q5)Explain what is meant by radioactive decay.A radioactive nucleus is represented by the symbol V.How is the new nucleus represented after the emission of
i)an alpha particle
ii)a beta particle
iii)a gamma ray?
Q1) Explain how radioactive nucei can emit beta particles even though atomic nuclei do not contain these particles.hence explain why the mass numbers of a radioactive nuclide does not change during beta decay.Use the basic law of radioactive decay to show that radiactive nuclei follow an exponential decay law.Hence obtain a formula,for the half-life of a radioactive nuclide,in terms of its disintegration constant. [DELHI 2004C]
Q2)Draw a labelled diagram for alpha particle scattering experiment.Give Rutherford's observation and discuss the significance of this experiment.Obtain The expression which helps us to get an idea of the size of a nucleus ,using these observation.[FOREIGN 2003]
Q3)Draw the graph to show variation of binding energy per nucleon with mass number of different nuclei.Calculate binding energy per nucleon of Ca nucleus.
Given : mass of Ca = 39.962589 u
mass of proton = 1.007825 u
mass of neutron = 1.008665 u
1 atomic mass unit(u) = 931 MeV [DELHI 2002]
Q4) a)Define the termdecay constant and half-life of a radioactive sample.Derive the relation connecting the two.
b)How many disintegration per second will occur in one garm of Uranium (at.no: 92,Mass no. :238),if its half life against alpha decay is 1.42x10^17 s?[DELHI 2001]
Q5)Explain what is meant by radioactive decay.A radioactive nucleus is represented by the symbol V.How is the new nucleus represented after the emission of
i)an alpha particle
ii)a beta particle
iii)a gamma ray?
The activity of a source undergoing a single step type of decay is Io at time t=0.Obtain an expression in terms of the half-life T1/2 for the activity I at any subsequent time t.[AI 2001C]
Q6)Define the binding energy of nucleus.A neutron is absorbed by a Li nucleus with the subsequent emission of an alpha particle.Write the energy released in this reaction.
Given: mass of Li : 6.015126 amu
" " neutron : 1.0086654 amu
" " He : 4.0026044 amu
" " H(tritium) :3.01 amu[DELHI 2000C]
Q7)What is meant by binding eneegy per nucleon? The bining energies of deutron and alpha particle are 1.25 and 7.2 MeV/nucleon respectively.Which nucleus is more stable ?
Caculate binding energy per nucleon of Fe.
Given : mass of Fe : 55.934939 amu
" " Proton : 1.007825 amu
" " neutron : 1.008665 amu [AI 2000C]
Q8)The energy levels of an atom are as shown below.Which of them will results in the transition of a photon of wavelength 275nm?[AI 1999]
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