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Modern Physics Test - 4
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  • Question 1/10
    4 / -1

    A radioactive sample consists of two distinct species having equal number of atoms initially. The mean life time of one species is τ and that of the other is 5τ. The decay products in both cases are stable. A plot is made of the total number of radioactive nuclei as a function of time. Which of the following figures best represent the form of this plot?

  • Question 2/10
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    The potential difference applied to an X-ray tube is 5kV and the current through it is 3.2mA. Then the number of electrons striking the target per second is

  • Question 3/10
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    A Hydrogen atom and a Li++ ion are both in the second excited state. If ℓ H and ℓ Li are their respective electronic angular momenta, and EH and ELi their respective energies, then

  • Question 4/10
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    The half-life of 215At is 100 μ s. The time taken for the radioactivity of a sample of 215At to decay to 1/16th of  its initial value is

  • Question 5/10
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    Which of the following processes represents a γ -decay ?

  • Question 6/10
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    The electric potential between a proton and an electron is given by  where r0 is a constant. AssumingBohr’s model to be applicable, write variation of rn with n, n being the principal quantum number?

  • Question 7/10
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    If the atom 100Fm257 follows the Bohr model and the radius of 100Fm257 is n times the Bohr radius, then find n.

  • Question 8/10
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    For uranium nucleus how does its mass vary with volume?

  • Question 9/10
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    A nucleus with mass number 220 initially at rest emits an α -particle. If the Q value of the reaction is 5.5 MeV, calculate the kinetic energy of the α -particle

  • Question 10/10
    4 / -1

    In a photoelectric experiment anode potential is plotted against plate current.

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