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Modern Physics ...

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  • Question 1
    4 / -1

    A radioactive material decays by simultaneous emission of two particles with respective half-lives 1620 and 810 years.
    The time, in years, after which one-fourth of the material remains is

  • Question 2
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    The probability of electrons to be found in the conduction band of an intrinsic semiconductor at a finite temperature

  • Question 3
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    A full-wave rectifier circuit along with the out-put is shown in Figure. The contribution (s) from the diode 1 is (are)

  • Question 4
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    As per Bohr model, the minimum energy (in eV) required to remove an electron from the ground state of doubly ionized Li atom (Z = 3) is

  • Question 5
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    The circuit shown in the figure contains two diodes each with a forward resistance of 50 ohms and with infinite backward resistance. If the battery voltage is 6V, the current through the 100 ohm resistance (in  amperes) is

  • Question 6
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    Which of the following statements is not true?

  • Question 7
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    The maximum kinetic energy of photoelectrons emitted from a surface when photons of energy 6 eV fall on it is 4 eV. The stopping potential, in volt, is

  • Question 8
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    In hydrogen spectrum the wavelength of Hα line is  656 nm, whereas in the spectrum  of a distant galaxy, Hα line wavelength is 706 nm. Estimated speed of the galaxy with respect to earth is,

  • Question 9
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    A particle of mass M at rest decays into two particles of masses m1 and m2, having non-zero velocities. The ratio of the de Broglie wavelengths of the particles, λ1/λ2, is

  • Question 10
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    Which of the following is a correct statement?

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