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Set 6 of 16 · Questions 151-180 of 453

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JEE Main Physics · Atoms · Set 6 (Q151-180)

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  1. 151.
    The interplanar distance in a crystal is 2.8 . The value of maximum wavelength which can be diffracted
    1. (1)
    2. (2)
    3. (3)
    4. (4)
  2. 152.
    The activity of a radioactive material is 2.56 x Ci. If the half life of the material is 5 days, after how many days the activity will become 2 x Ci?
    1. (1)30 days
    2. (2)35 days
    3. (3)40 days
    4. (4)25 days
  3. 153.
    In hydrogen atom spectrum, ( Rydberg's constant)
    (A) the maximum wavelength of the radiation of Lyman series is
    (B) the Balmer series lies in the visible region of the spectrum
    (C) the minimum wavelength of the radiation of Paschen series is
    (D) the minimum wavelength of Lyman series is Choose the correct answer from the options given below:
    1. (1)(B), (D) Only
    2. (2)(A), (B) and (C) Only
    3. (3)(A), (B) and (D) Only
    4. (4)(A), (B) Only
  4. 154.
    The radius of hydrogen atom in the ground state is . After collision with an electron it is found to have radius of , the principal quantum number ' ' of the final state of the atom is
    1. (1)
    2. (2)
    3. (3)
    4. (4)
  5. 155.
    A hydrogen atom, initially in the ground state is excited by absorbing a photon of wavelength .The radius of the atom in the excited state, in terms of Bohr radius , will be : eV- Å)
    1. (1)
    2. (2)
    3. (3)
    4. (4)
  6. 156.
    In hydrogen atom, if an electron in the orbit with principal quantum number ' ' jumps to the first excited state, the wavelength of the emitted photon is ' '. Then the value of is (R-Rydberg constant)
    1. (1)
    2. (2)
    3. (3)
    4. (4)
  7. 157.
    The radius of inner most orbit of hydrogen atom is . What is the radius of third allowed orbit of hydrogen atom? [NEET 2023]
    1. (1)
    2. (2)
    3. (3)
    4. (4)
  8. 158.
    The difference in the wavelength between the maximum and minimum of Balmer series [Use ]
    1. (1)
    2. (2)
    3. (3)
    4. (4)
  9. 159.
    A nucleus at rest disintegrates into two smaller nuclei with their masses in the ratio of . After disintegration they will move:
    1. (1)in the same direction with same speed.
    2. (2)in opposite directions with the same speed.
    3. (3)in opposite directions with speed in the ratio of respectively.
    4. (4)in opposite directions with speed in the ratio of respectively.
  10. 160.
    An electron & a photon have same energy . Find the ratio of de Broglie wavelength of electron to wavelength of photon. Given mass of electron is m & speed of light is C.
    1. (1)
    2. (2)
    3. (3)
    4. (4)
  11. 161.
    An electron is revolving in its Bohr orbit having Bohr radius of , then the radius of third orbit is
    1. (1)
    2. (2)
    3. (3)
    4. (4)
  12. 162.
    Consider orbit of (Helium), using non‐relativistic approach, the speed of electron in this orbit will be [given constant, and (Planck’s Constant) ]
    1. (1)
    2. (2)
    3. (3)
    4. (4)
  13. 163.
    The de-Broglie wavelength associated with electron of hydrogen atom in the ground state is
    1. (1)
    2. (2)
    3. (3)
    4. (4)
  14. 164.
    The wavelength of an electron and of a photon of same energy are related by:
    1. (1)
    2. (2)
    3. (3)
    4. (4)
  15. 165.
    If an electron is moving in the orbit of the hydrogen atom, then its velocity for the orbit is given as:
    1. (1)
    2. (2)
    3. (3)
    4. (4)
  16. 166.
    A particle of mass m moves in a circular orbit in a central potential field . If Bohr’s quantization conditions are applied, radii of possible orbitls and energy levels vary with quantum number n as:
    1. (1)
    2. (2)
    3. (3)
    4. (4)
  17. 167.
    The longest wavelength associated with Paschen series is: (Given unit)
    1. (1)
    2. (2)
    3. (3)
    4. (4)
  18. 168.
    The ratio of maximum to minimum wavelength in Balmer series of an hydrogenic atom is
    1. (1)
    2. (2)
    3. (3)
    4. (4)
  19. 169.
    The anode voltage of a photocell is kept fixed. The wavelength λ of the light falling on the cathode is gradually changed. The plate current I of the photocell varies as follows : (Assume that rate of photon falling is maintained constant)
    1. (1)
    2. (2)
    3. (3)
    4. (4)
  20. 170.
    The ratio of kinetic energy to the total energy of an electron in a Bohr orbit of the hydrogen atom, is [NEET 2018]
    1. (1)
    2. (2)
    3. (3)
    4. (4)
  21. 171.
    Imagine that the electron in a hydrogen atom is replaced by a muon (μ). The mass of muon particle is 207 times that of an electron and charge is equal to the charge of an electron. The ionization potential of this hydrogen atom will be:
    1. (1)13.6 eV
    2. (2)2815.2 eV
    3. (3)331.2 eV
    4. (4)27.2 eV
  22. 172.
    Kinetic energy of the particle is E and it’s De-Broglie wavelength is . On increasing it's KE by ∆E, it's new De-Broglie wavelength becomes . Then AE is
    1. (1)3 E
    2. (2)E
    3. (3)2 E
    4. (4)4 E
  23. 173.
    If a radioactive clement having half-life of 30 min is undergoing beta decay, the fraction of radioactive element remains undecayed after 90 min. will be:
    1. (1)
    2. (2)
    3. (3)
    4. (4)
  24. 174.
    The magnetic moment of a revolving electron around the nucleus varies with the principal quantum number as
    1. (1)
    2. (2)
    3. (3)
    4. (4)
  25. 175.
    Consider an electron in the orbit of a hydrogen atom in the Bohr model. The circumference of the orbit can be expressed in terms of de Broglie wavelength of that electron as
    1. (1)
    2. (2)
    3. (3)
    4. (4)
  26. 176.
    Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R
    Assertion A: The binding energy per nucleon is practically independent of the atomic number for nuclei of mass number in the range 30 to 170.
    Reason R: Nuclear force is short ranged
    In the light of the above statements, choose the correct answer from the options given below
    1. (1)A is false but R is true
    2. (2)Both A and R are true and R is the correct explanation of A
    3. (3)Both A and R are true but R is NOT the correct explanation of A
    4. (4)A is true but R is false.
  27. 177.
    The ratio of wavelengths of the last line of Balmer series and the last line of Lyman series is [NEET 2017]
    1. (1)2
    2. (2)1
    3. (3)4
    4. (4)0.5
  28. 178.
    In the Bohr model an electron of mass moves in a circular orbit around the proton. Considering the orbiting electron to be a circular current loop, the magnetic moment of the hydrogen atom, when the electron is in nth excited state. (Assume, Planck's constant)
    1. (1)
    2. (2)
    3. (3)
    4. (4)
  29. 179.
    The half life of a radioactive substance is 5 years. After x years a given sample of the radioactive substance gest reduced to 6.25% of its initial value of x is_______.
  30. 180.
    In a nuclear fission process, a high mass nuclide with binding energy Nucleon dissociated into middle mass nuclides , having binding energy of Nucleon. The energy released in the process would be______ .