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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.

    Materials and Components problems

    Search Results

    • 1. Assertion (A): Acceptor extrinsic semiconductor has higher conductivity than intrinsic semiconductor.

      Reason (R): Addition of p-type impurity produces an allowable discrete energy level just above valence band.


    • Options
    • A. Both A and R are true and R is correct explanation of A
    • B. Both A and R are true but R is not correct explanation of A
    • C. A is true but R is false
    • D. A is false but R is true
      • Discuss
    • 2. n type semiconductors

    • Options
    • A. are negatively charged
    • B. are produced when indium as impurity is added to germanium
    • C. are produced phosphorus as impurity is added to silicon
    • D. none of the above
      • Discuss
    • 3. ?0 has no other physical meaning than that of a fundamental conversion factor.

    • Options
    • A. True
    • B. False
      • Discuss
    • 4. When a potential is applied across an intrinsic semiconductor, holes flow

    • Options
    • A. towards positive terminal
    • B. away from positive terminal
    • C. in the external circuit only
    • D. none of the above
      • Discuss
    • 5. A capacitor can be represented by a capacitance and resistance in parallel. For a good capacitor, this parallel resistance should be

    • Options
    • A. negligible
    • B. low
    • C. high
    • D. very high
      • Discuss
    • 6. The colour code on a carbon resistor is brown-black-red-gold. The value of resistance is

    • Options
    • A. 100 ?
    • B. 1000 ?
    • C. 1000 ? ± 5%
    • D. 1000 ? ± 10%
      • Discuss
    • 7. Tesla is a unit of

    • Options
    • A. flux
    • B. field strength
    • C. flux density
    • D. MMF
      • Discuss
    • 8. The number of protons in germanium atom is

    • Options
    • A. 4
    • B. 16
    • C. 28
    • D. 32
      • Discuss
    • 9. A magnet does not attract

    • Options
    • A. nickel
    • B. iron
    • C. copper
    • D. iron and copper
      • Discuss
    • 10. At 0 K, silicon and germanium behave like monoatomic crystals.

    • Options
    • A. True
    • B. False
      • Discuss

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