JEE Questions for Physics Atoms And Nuclei Quiz 9 - MCQExams.com

The wavelength of the first line of Balmer series is 6563 Å. The Rydberg constant for hydrogen is about

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  • 2)
    Physics-Atoms and Nuclei-62782.png

  • Physics-Atoms and Nuclei-62783.png

  • Physics-Atoms and Nuclei-62784.png
According to Bohr\'s theory the moment of momentum of an electron revolving in second orbit of hydrogen atom will be
  • 2πh
  • πh

  • Physics-Atoms and Nuclei-62786.png

  • Physics-Atoms and Nuclei-62787.png
The velocity of an electron in the second orbit of sodium atom (atomic number =is v. The velocity of an electron in its fifth orbit will be
  • v
  • 2)
    Physics-Atoms and Nuclei-62789.png

  • Physics-Atoms and Nuclei-62790.png

  • Physics-Atoms and Nuclei-62791.png
The absorption transitions between the first and the fourth energy states of hydrogen atom are 3. The emission transitions between these states will be
  • 3
  • 4
  • 5
  • 6
The ratio of longest wavelength and the shortest wavelength observed in the five spectral series of emission spectrum of hydrogen is

  • Physics-Atoms and Nuclei-62794.png
  • 2)
    Physics-Atoms and Nuclei-62795.png
  • 25

  • Physics-Atoms and Nuclei-62796.png
As per Bohr model, the minimum energy (in eV) required to remove an electron from the ground state of doubly ionized Li atom (Z =is
  • 1.51
  • 13.6
  • 40.8
  • 122.4
Which of these is non-divisible?
  • Nucleus
  • Photon
  • Proton
  • Atom
According to Bohr\'s model, the radius of the second orbit of helium atom is
  • 0.53 Å
  • 1.06 Å
  • 2.12 Å
  • 0.265 Å
The fact that photons carry energy was established by
  • Doppler's effect
  • Compton's effect
  • Bohr's theory
  • Diffraction of light
An ionic atom equivalent to hydrogen atom has wavelength equal to 1/4 of the wavelengths of hydrogen lines. The ion will be
  • He+
  • Li++
  • Ne9+
  • Na10+

Physics-Atoms and Nuclei-62801.png

  • Physics-Atoms and Nuclei-62802.png
  • 2)
    Physics-Atoms and Nuclei-62803.png

  • Physics-Atoms and Nuclei-62804.png

  • Physics-Atoms and Nuclei-62805.png
Hydrogen atom emits blue light when it changes from n = 4 energy level to the n = 2 level. Which colour of light would the atom emit when it changes from the n = 5 level to the n = 2 level?
  • Red
  • Yellow
  • Green
  • Violet

Physics-Atoms and Nuclei-62807.png
  • n = 4
  • n = 2
  • n = 16
  • n = 3
The splitting of line into groups under the effect of magnetic field is called
  • Zeeman's effect
  • Bohr's effect
  • Heisenberg's effect
  • Magnetic effect
The first line of Balmer series has wavelength 6563 Å. What will be the wavelength of the first member of Lyman series?
  • 1215.4 Å
  • 2500 Å
  • 7500 Å
  • 600 Å
The wavelength of Lyman series isis

  • Physics-Atoms and Nuclei-62810.png
  • 2)
    Physics-Atoms and Nuclei-62811.png

  • Physics-Atoms and Nuclei-62812.png

  • Physics-Atoms and Nuclei-62813.png
When hydrogen atom is in its first excited level, its radius is ...its ground state radius
  • Half
  • Same
  • Twice
  • Four times
Hydrogen atom excites energy level from fundamental state to n = 3. Number of spectrum lines according to Bohr, is
  • 4
  • 3
  • 1
  • 2
Number of spectral lines in hydrogen atom is
  • 3
  • 6
  • 15
  • Infinite
The nuclear radius of a certain nucleus is 7.2 fm and it has a charge of 1.28 × 10-17 C. The number of neutrons inside the nucleus is
  • 136
  • 142
  • 140
  • 132
  • 126
For electron moving in nth orbit of H-atom the angular velocity is proportional to
  • n
  • 1/n
  • n3
  • 1/n3
The energy required to excite an electron from the ground state of hydrogen atom to the first excited state, is

  • Physics-Atoms and Nuclei-62818.png
  • 2)
    Physics-Atoms and Nuclei-62819.png

  • Physics-Atoms and Nuclei-62820.png

  • Physics-Atoms and Nuclei-62821.png
Which of the following phenomena suggests the presence of electron energy levels in atoms?
  • Radio active decay
  • Isotopes
  • Spectral lines
  • α-particles scattering
Which of the following spectral series in hydrogen atom give spectral line of 4860 Å?
  • Lyman
  • Balmer
  • Paschen
  • Brackett
Energy of electron in an orbit of H-atom is
  • Positive
  • Negative
  • Zero
  • Nothing can be said
The time of revolution of an electron around a nucleus of charge Ze in nth Bohr orbit is directly proportional to
  • n
  • 2)
    Physics-Atoms and Nuclei-62824.png

  • Physics-Atoms and Nuclei-62825.png

  • Physics-Atoms and Nuclei-62826.png
If R is the Rydberg\'s constant for hydrogen the wave number of the first line in the Lyman series will be

  • Physics-Atoms and Nuclei-62828.png
  • 2)
    Physics-Atoms and Nuclei-62829.png

  • Physics-Atoms and Nuclei-62830.png
  • 2R
In Bohr model of hydrogen atom, the ratio of periods of revolution of an electron in n = 2 and n =1 orbits is
  • 2 : 1
  • 4 : 1
  • 8 : 1
  • 16 : 1
The ratio of the longest to shortest wavelengths in Brackett series of hydrogen spectra is

  • Physics-Atoms and Nuclei-62833.png
  • 2)
    Physics-Atoms and Nuclei-62834.png

  • Physics-Atoms and Nuclei-62835.png

  • Physics-Atoms and Nuclei-62836.png
The ratio of minimum to maximum wavelength in Balmer series is
  • 5 : 9
  • 5 : 36
  • 1 : 4
  • 3 : 4
According to classical theory, the circular path of an electron in Rutherford atom is
  • Spiral
  • Circular
  • Parabolic
  • straight line
The wavelength of yellow line of sodium is 5896 Å. Its wave number will be
  • 50883 × 1010 per second
  • 16961 per cm
  • 17581 per cm
  • 50883 per cm
Radius of the first orbit of the electron in a hydrogen atom is 0.53 Å. So, the radius of the third orbit will be
  • 2.12 Å
  • 4.77 Å
  • 1.06 Å
  • 1.59 Å
In hydrogen atom which quantity is integral multiple of
Physics-Atoms and Nuclei-62841.png
  • Angular momentum
  • Angular velocity
  • Angular acceleration
  • Momentum
In the following transitions, which one has higher frequency?
  • 3 – 2
  • 4 – 3
  • 4 – 2
  • 3 – 1
The ratio of the wavelengths for 2 → 1 transition in Li++, He+ and H is
  • 1 : 2 : 3
  • 1 : 4 : 9
  • 4 : 9 : 36
  • 3 : 2 : 1
The ionisation potential of hydrogen atom is –13.6 eV. An electron in the ground state of a hydrogen atom absorbs a photon of energy 12.75 eV. How many different spectral lines can one expect when the electron make a downward transition?
  • 1
  • 4
  • 2
  • 6
Whenever a hydrogen atom emits a photon in the Balmer series
  • It may not emit any more photons
  • It may emit another photon in the Paschen series
  • It must emit another photon in the Lyman series
  • It may emit another photon in the Balmer series
In hydrogen atom, when electron jumps from second to first orbit, then energy emitted is
  • –13.6 eV
  • –27.2 eV
  • –6.8 eV
  • None of these
Which of the following transitions will have highest emission wavelength ?
  • n = 2 to n = 1
  • n = 1 to n = 2
  • n = 2 to n = 5
  • n = 5 to n = 2
When the wave of hydrogen atom comes from infinity into the first orbit then the value of wave number is
  • 109700 cm–1
  • 1097 cm–1
  • 109 cm–1
  • None of these
With the increase in principal quantum number, the energy difference between the two successive energy levels
  • Increases
  • Decreases
  • Remains constant
  • Sometimes increases and sometimes decreases
If the binding energy of the electron in a hydrogen atom is 13.6 eV, the energy required to remove the electron from the first excited state of Li++ is
  • 122.4 eV
  • 30.6 eV
  • 13.6 eV
  • 3.4 eV
For ionising an excited hydrogen atom, the energy required (in eV) will be
  • A little less then 13.6
  • 13.6
  • More than 13.6
  • 3.4 or less
The colour of the second line of Balmer series is
  • Blue
  • Yellow
  • Red
  • Violet
Which state of triply ionised Beryllium (Be+++) has the same orbital radius as that of the ground state of hydrogen?
  • n = 4
  • n = 3
  • n = 2
  • n = 1
The ratio of areas within the electron orbits for the first excited state to the ground state for hydrogen atom is
  • 16 : 1
  • 18 : 1
  • 4 : 1
  • 2 : 1
The kinetic energy of an electron revolving around a nucleus will be
  • Four times of P.E.
  • Double of P.E.
  • Equal to P.E.
  • Half of its P.E.
The kinetic energy of electron in the first Bohr orbit of the hydrogen atom is
  • –6.5 eV
  • –27.2 eV
  • 13.6 eV
  • –13.6 eV
The ratio of minimum wavelengths of Lyman and Balmer series will be
  • 5
  • 10
  • 1.25
  • 0.25
0:0:1


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