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Modern Physics Test - 1
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  • Question 1/10
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    The plate resistance of a triode is 3 × 103 ohms and its mutual conductance is 1.5 × 10–3 amp/volt. The amplification factor of the triode is

  • Question 2/10
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    The half life of radioactive Radon is 3.8 days. The time at the end of which 1/20 th of the radon sample will remainundecayed is (given log10 e = 0.4343)

  • Question 3/10
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    An alpha particle of energy 5 MeV is scattered through 180° by a fixed uranium nucleus. The distance of closest approach is of the order of

  • Question 4/10
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    Beta rays emitted by a radioactive material are

  • Question 5/10
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    If elements with principal quantum number n > 4 were not allowed in nature, the  number of possible elements would be

  • Question 6/10
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    Consider the spectral line resulting from the  transition n = 2 → n = 1 in the atoms and ions given below. The shortest wavelength is produced by

  • Question 7/10
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    The equation  represents

  • Question 8/10
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    Fast neutrons can easily be slowed down by

  • Question 9/10
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    Consider α particles, β particles and γ - rays, each having an energy of 0.5 MeV. In increasing order of penetrating powers, the radiations are:

  • Question 10/10
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    An energy of 24.6 eV is required to remove one of the electrons from a neutral helium atom. The energy in (eV) required to remove both the electrons from a neutral helium atom is

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