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  • Question

  • In the wave mechanical theory, the maximum of the charge distribution in the ground state occurs for a distance from the nucleus equal to


  • Options
  • A. first Bohr radius
  • B. second Bohr radius
  • C. third Bohr radius
  • D. either first or second Bohr radius

  • Correct Answer
  • first Bohr radius 

    Explanation
    The total charge associated with an electron moving about nucleus in the ground state of hydrogen atom is given by In the wave mechanical theory, the maximum of the charge distribution in the ground state occurs for 4p2rr(r)dr.

    This integrand has a maximum value at r = radius of first Bohr orbit.

    More questions

    • 1. A copper atom is neutral. Its core has a net charge of

    • Options
    • A. 0
    • B. + 1
    • C. - 1
    • D. + 2
      • Discuss
    • 2. The characteristics of which device has peak point and valley point

    • Options
    • A. SCR
    • B. PUT
    • C. SCS
    • D. Shockley diode
      • Discuss
    • 3. Schrodinger wave equation is partial differential equation.

    • Options
    • A. True
    • B. False
      • Discuss
    • 4. The output frequency of a cycloconverter can be changed by changing the firing angle.

    • Options
    • A. True
    • B. False
      • Discuss
    • 5. Most of the memory chips in static RAM

    • Options
    • A. do not require any supply
    • B. need 2 V supply
    • C. need 5 V supply
    • D. need 12 V supply
      • Discuss
    • 6. In crystalline solids, atoms are stacked in a regular manner.

    • Options
    • A. True
    • B. False
      • Discuss
    • 7. The classes of solid dielectrics are

    • Options
    • A. A, B, C, D, E, F, H
    • B. A E B F H C D
    • C. Y A E B F H C
    • D. A E B F H C
      • Discuss
    • 8. The unit for mmf is

    • Options
    • A. A
    • B. Wb
    • C. T
    • D. V
      • Discuss
    • 9. In a single phase full wave regulator, the firing angles in the positive and negative half cycles are generally

    • Options
    • A. equal
    • B. different
    • C. equal or different
    • D. different but sometimes equal
      • Discuss
    • 10. The real part of complex dielectric constant and tan? for a dielectric are 2.1 and 5 x 10-4 at 100 Hz respectively. The imaginary part of dielectric constant at 100 Hz is

    • Options
    • A. 1.05 x 10-3
    • B. 2.1 x 10-3
    • C. 5 x 10-3
    • D. 1.05 x 10-2
      • Discuss

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