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Atoms and Nucle...

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  • Question 1
    4 / -1

    A radioactive material has a half life of 10 days. What fraction of the material would remain after 30 days?

  • Question 2
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    Which of the following is not conserved in nuclear reactions?

  • Question 3
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    In a sample of radioactive material, what fraction of the initial number of active nuclei will remain undisintegrated after half of a half life of the sample?

  • Question 4
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    A radioactive nucleus is being produced at a constant rate ∝ per second. Its decay constant is λ. If N0 are the number of nuclei at time t = 0, then the maximum number of nuclei possible are

  • Question 5
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    The binding energies of nuclei X and Y are E1 and E2 respectively. Two atoms of X fuse to give one atom of Y and an energy Q is released. Then

  • Question 6
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    The binding energy of an electron in the ground state of He is equal to 24.6 eV. The energy required to remove both the electrons is

  • Question 7
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    A particle of mass 3 m at rest decays into two particles of masses m and 2m having non zero velocities. The ratio of the de-Broglie wavelength of the particles (λ1/λ2) is

  • Question 8
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    The order of energies of energy levels A, B and C is EA < EB < EC. If the wavelength corresponding to transitions C → B, B → A and C→ A are λ1, λ2 and λ3 respectively, then which of the following relation is correct?

  • Question 9
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    The energy required to excite an electron from n = 2 to n = 3 energy level is 47.2 eV. The charge no. of the nucleus, around which the electron is revolving will be

  • Question 10
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    The ratio (R) of the rate of production of neutrons to the rate of leakage of neutrons from a spherical body of uranium of radius r is proportional to

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