JEE Questions for Physics Atoms And Nuclei Quiz 16 - MCQExams.com

The size of the atom is of the order of
  • 10–14 m
  • 10–10 m
  • 10–8 m
  • 10–5 m
The size of the nucleus is of the order of
  • 10–10 m
  • 10–14 m
  • 10–19 m
  • 10–3 m
The ratio of atomic volume of nuclear volume is of the order of
  • 10–15
  • 10–10
  • 1015
  • 10–10
Plutonium decays with half life time 24000 yer. if Plutonium is stored after 72000 yes, the fraction of it that remain

  • Physics-Atoms and Nuclei-63233.png
  • 2)
    Physics-Atoms and Nuclei-63234.png

  • Physics-Atoms and Nuclei-63235.png

  • Physics-Atoms and Nuclei-63236.png
The radio of minimum to maximum wave length in Balmer series is

  • Physics-Atoms and Nuclei-63238.png
  • 2)
    Physics-Atoms and Nuclei-63239.png

  • Physics-Atoms and Nuclei-63240.png

  • Physics-Atoms and Nuclei-63241.png
If the binding energy of electron in a hydrogen atom is 13.6 eV , the energy required to remove the electron from the second excited state of Li++ is
  • 13.6 eV
  • 3.4 eV
  • 30.6 eV
  • 122.4 eV
A radioactive substance decays to 1/16 th of its initial activity in 40 days. the half life of the radioactive substance expressed in day is
  • 20
  • 5
  • 10
  • 4

Physics-Atoms and Nuclei-63245.png

  • Physics-Atoms and Nuclei-63246.png
  • 2)
    Physics-Atoms and Nuclei-63247.png

  • Physics-Atoms and Nuclei-63248.png

  • Physics-Atoms and Nuclei-63249.png
Two deutrons each of mass m fuse to form helium resulting in release of energy E the mass of helium formed is

  • Physics-Atoms and Nuclei-63251.png
  • 2)
    Physics-Atoms and Nuclei-63252.png

  • Physics-Atoms and Nuclei-63253.png

  • Physics-Atoms and Nuclei-63254.png
what percent of original radio active substances is left after 5 half life time
  • 3 %
  • 5 %
  • 6 %
  • 12 %
In which region of electromagnetic spectrum does the Lyman series of hydrogen atom like
  • x - ray
  • Intrared
  • visible
  • ultraviolet
In terms of Rydberg constant R. The wave number of first Balmer line is

  • Physics-Atoms and Nuclei-63257.png
  • 2)
    Physics-Atoms and Nuclei-63258.png
  • R

  • Physics-Atoms and Nuclei-63259.png
The hydrogen atom can give spectral lines in the series Lyman, Balmer and Paschen. which of the following statement is correct
  • Lyman series is in the infrared region
  • Balmer series is in the ultraviolet region
  • Balmer series is in the visible region
  • Paschen series is in the visible region
The ionigation energy of hydrogen atom is 13.6 eV. The ionigation energy of helium atom would be
  • 27.2 eV
  • 13.6 eV
  • 54.4 eV
  • 6.8 eV
A gamma ray Photon creates an electron- Position Pair. If the rest mass energy of an electron is 0.5 MeV. and the total kinetic energy 0.7 MeV, then the energy of the gamma ray Photon must be
  • 3.9 MeV
  • 1.78 MeV
  • 0.78 MeV
  • 0.16 MeV
The masses of neutron and Proton are 1.0087 amu and 1.0073 amu respectively. It the neutron and Protons combines to form binding energy of the helium nucleus will be
  • 14.2 MeV
  • 28.4 MeV
  • 27.3 MeV
  • 20.8 MeV
Large angle scattering of α - particle could not be explained by
  • Thomson model
  • Ruther Rutherford and Thomson modal
  • Both Rutherford and Thomson modal
  • Neither Rutherford modal nor Thomson modal
The activity of a radioactive sample is measured as no counts Per minute at t = o and no counts per minute t = 5 min The time (in min) at which activity reduces to half its values is

  • Physics-Atoms and Nuclei-63264.png
  • 2)
    Physics-Atoms and Nuclei-63265.png

  • Physics-Atoms and Nuclei-63266.png

  • Physics-Atoms and Nuclei-63267.png
A heavy nucleus at lest breaks into two figments which fly off with velocities in the ratio 8:1 The ratio of radial of the figments is
  • 1 : 2
  • 4 : 1
  • 1 : 4
  • 2 : 1
The binding energy per nucleus of 8O16 is 7.97 Me V and that of 8O17 is 7.75 MeV The energy (in-MeV) required to remove a neutron from 8O17 is
  • 3.65
  • 7.86
  • 3.52
  • 4.23
The shape of the graph ln I → t is
  • straight Line
  • Parabolic curve
  • Hyperbole curve
  • random shade curve
The fig shows an energy levels for the electron in a certain atom which transition in a represents the emission of a Photon with most energy?
Physics-Atoms and Nuclei-63271.png
  • III
  • IV
  • I
  • II
The Probability of survival of a radioactive nucleus for one mean life time is

  • Physics-Atoms and Nuclei-63272.png
  • 2)
    Physics-Atoms and Nuclei-63273.png

  • Physics-Atoms and Nuclei-63274.png

  • Physics-Atoms and Nuclei-63275.png
As the electron in Bohr is orbit of hydrogen atom Passes from state n = 2 to n = 1, the K.E. and Potential energy changes as
  • Two fold , also two fold
  • four fold , two fold
  • four fold , also four fold
  • two fold , four fold

Physics-Atoms and Nuclei-63277.png
  • β, α, γ
  • α, β, γ
  • γ, β, α
  • β, γ, α
The wave length of the first line of Lyman series for hydrogen atom is equal to that of hydrogen atom is equal to that of second line of Balmar series for a hydrogen like ion. The atomic number Z of hydrogen like ion is
  • 1
  • 2
  • 3
  • 4
At a certain time, a radio active sample contains 2 × 1020 atoms and disintegration rate is 3 × 1010 atom persec. when 2 × 1015 atoms left to decay its disintegation rate will be
  • 3 × 105 atom / s
  • 3 × 1010 atom / s
  • 6.6 × 101 atom / s
  • 2.0 × 102 atom / s
Excited hydrogen atom emits a Photon of wave length in returning to the ground state The quantum number n of exulted state is given by

  • Physics-Atoms and Nuclei-63281.png
  • 2)
    Physics-Atoms and Nuclei-63282.png

  • Physics-Atoms and Nuclei-63283.png

  • Physics-Atoms and Nuclei-63284.png

Physics-Atoms and Nuclei-63286.png
  • 72
  • 78
  • 65
  • 80

Physics-Atoms and Nuclei-63288.png
  • a → r, b → s, c → q, d → p
  • a → q, b → p, c → s, d → r
  • a → s, b → r, c → q, d → p
  • b → s, c → p, c → q, d → r
The energy levels of the hydrogen spectrum is shown in figure. There are some transitions A,B,C,D and E. Transition A, B and C respectively represent
Physics-Atoms and Nuclei-63290.png
  • First member of Lyman series, third spectral line of Balmer series and the second spectral line of Paschen series
  • Ionization potential of hydrogen, second spectral line of Balmer series and third spectral line of Paschen series
  • Series limit of Lyman series, third spectral line of Balmer series and second spectral line of Paschen series
  • Series limit of Lyman series, second spectral line of Balmer series and third spectral line of Paschen series
In the figure D and E respectively represent
Physics-Atoms and Nuclei-63292.png
  • Absorption line of Balmer series and the ionization energy of hydrogen
  • Absorption line of Balmer series and the wavelength lesser than lowest of the Lyman series
  • Spectral line of Balmer series and the maximum wavelength of Lyman series
  • Spectral line of Lyman series and the absorption of greater wavelength of limiting value of Paschen series
The Rutherford α-particles experiment shows that most of the α-particles pass through almost unscattered while some are scattered through large angles. What information does it give about the structure of the atom
  • Atom is hollow
  • The whole mass of the atom is concentrated in a small centre called nucleus
  • Nucleus is positively charged
  • All the above
Which of the following is true?
  • Lyman series is a continuous spectrum
  • Paschen series is a line spectrum in the infrared
  • Balmer series is a line spectrum in the ultraviolet
  • The spectral series formula can be derived from the Rutherford model of the hydrogen atom
The transition from he state n = 4 to n = 3 in a hydrogen like atom results in ultraviolet radiation. Infrared radiation will be obtained in the transition from
  • 2 → 1
  • 3 → 2
  • 4 → 2
  • 5 → 4

Physics-Atoms and Nuclei-63295.png

  • Physics-Atoms and Nuclei-63296.png
  • 2)
    Physics-Atoms and Nuclei-63297.png

  • Physics-Atoms and Nuclei-63298.png

  • Physics-Atoms and Nuclei-63299.png
In a beryllium atom, if a0 be the radius of the first orbit, then the radius of the second orbit will be in general

  • Physics-Atoms and Nuclei-63301.png
  • 2)
    Physics-Atoms and Nuclei-63302.png

  • Physics-Atoms and Nuclei-63303.png

  • Physics-Atoms and Nuclei-63304.png
Every series of hydrogen spectrum has an upper and lower limit in wavelength. The spertral series which has an upper limit of wavelength equal to 18752 Å is
(Rydberg constant R = 1.097 × 107 per metre)
  • Balmer series
  • Lyman series
  • Paschen series
  • Pfund series
The following diagram indicates the energy levels of a certain atom when the system moves from 2E level to E, emitting a photon of wavelength λ. The wavelength
Physics-Atoms and Nuclei-63307.png
  • λ/3
  • 3 λ/4
  • 4 λ/3
  • 3 λ
A beam of fast moving alpha particles were directed towards a thin film of gold. The parts A’, B’ and C’ of the transmitted and reflected beams corresponding to the incident parts A, B and C of the beam, are shown in the adjoining diagram. The number of alpha particles in
Physics-Atoms and Nuclei-63309.png
  • B’ will be minimum and in C’ maximum
  • A’ will be maximum and in B’ minimum
  • A’ will be minimum and in B’ maximum
  • C’ will be minimum and in B’ maximum
Consider an electron in the nth orbit of a hydrogen atom in the Bohr model. The circumference of the orbit can be expressed in terms of the de Broglie wavelength λ of that electron as
  • (0.259)nλ
  • 2)
    Physics-Atoms and Nuclei-63310.png
  • (13.6)λ
  • nλ
An electron of an atom transits from n1 to n2. In which of the following maximum frequency of photon will be emitted?
  • n1 = 1 to n2 = 2
  • n1 = 2 to n2 = 1
  • n1= 2 to n2 = 6
  • n1= 6 to n2 = 2
Which of the following statements about the Bohr model of the hydrogen atom is false?
  • Acceleration of electron in n = 2 orbit is less than that in n =1 orbit
  • Angular momentum of electron in n = 2 orbit is more than that in n =1 orbit
  • Kinetic energy of electron in n = 2 orbit is less than that in n =1 orbit
  • potential energy of electron in n = 2 orbit is less than that in n =1 orbit
The Rydberg constant R for hydrogen is

  • Physics-Atoms and Nuclei-63312.png
  • 2)
    Physics-Atoms and Nuclei-63313.png

  • Physics-Atoms and Nuclei-63314.png

  • Physics-Atoms and Nuclei-63315.png
In the Bohr model of a hydrogen atom, the centripetal force is furnished by the coulomb attraction between the proton and the electron. If a0 is the radius of the ground state orbit, m is the mass, e is the charge on the electron and ε0 is the vacuum permittivity, the speed of the electron is
  • 0
  • 2)
    Physics-Atoms and Nuclei-63317.png

  • Physics-Atoms and Nuclei-63318.png

  • Physics-Atoms and Nuclei-63319.png
In Bohr\'s model of hydrogen atom, let PE represents potential energy and TE the total energy. In going to a higher level
  • PE decreases, TE increases
  • PE increases, TE increases
  • PE decreases, TE decreases
  • PE increases, TE decreases
The extreme wavelengths of Paschen series are
  • 0.365μm and 0.565 μm
  • 0.818μm and 1.89μm
  • 1.45μm and 4.04µm
  • 2.27μm and 7.43 μm
The third line of Balmer series of an ion equivalent to hydrogen atom has wavelength of 108.5 nm. The ground state energy of an electron of this ion will be
  • 3.4 eV
  • 13.6 eV
  • –54.4 eV
  • 122.4 eV
The electron in a hydrogen atom makes a transition from an excited state to the ground state. Which of the following statements is true
  • Its kinetic energy increases and its potential and total energies decrease
  • Its kinetic energy decreases, potential energy increases and its total energy remains the same
  • Its kinetic and total energies decreases and its potential energy increases
  • Its kinetic, potential and total energies decrease
Which of the following is true for number of spectral lines in going from Lyman series to P-fund series ?
  • Increases
  • Decreases
  • Unchanged
  • May decrease or increase
0:0:1


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