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General
Easy
Question
In Bohr's model, the atomic radius of the first orbit is 
, then the radius of the third orbit is
The correct answer is:
Related Questions to study
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According to Bohr's model, the radius of the second orbit of helium atom is
According to Bohr's model, the radius of the second orbit of helium atom is
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According to Bohr's theory, the expressions for the kinetic and potential energy of an electron revolving in an orbit is given respectively by
According to Bohr's theory, the expressions for the kinetic and potential energy of an electron revolving in an orbit is given respectively by
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The figure indicates the energy level diagram of an atom and the origin of six spectral lines in emission (e.g. line no. 5 arises from the transition from level B to A). The following spectral lines will also occur in the absorption spectrum
The figure indicates the energy level diagram of an atom and the origin of six spectral lines in emission (e.g. line no. 5 arises from the transition from level B to A). The following spectral lines will also occur in the absorption spectrum
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Figure shows the energy levels P, Q, R, S and G of an atom where G is the ground state. A red line in the emission spectrum of the atom can be obtained by an energy level change from Q to S. A blue line can be obtained by following energy level change
Figure shows the energy levels P, Q, R, S and G of an atom where G is the ground state. A red line in the emission spectrum of the atom can be obtained by an energy level change from Q to S. A blue line can be obtained by following energy level change
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A beam of fast moving alpha particles were directed towards a thin film of gold. The parts 
and 
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
A beam of fast moving alpha particles were directed towards a thin film of gold. The parts and 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
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The following diagram indicates the energy levels of a certain atom when the system moves from 2E level to E, a photon of wavelength 
is emitted. The wavelength of photon produced during its transition from 
level to E is
The following diagram indicates the energy levels of a certain atom when the system moves from 2E level to E, a photon of wavelength is emitted. The wavelength of photon produced during its transition from level to E is
Physics-General
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Energy levels A, B, C of a certain atom corresponding to increasing values of energy i.e. 
. If 
are the wavelengths of radiations corresponding to the transitions C to B, B to A and C to A respectively, which of the following statements is correct
Energy levels A, B, C of a certain atom corresponding to increasing values of energy i.e. . If are the wavelengths of radiations corresponding to the transitions C to B, B to A and C to A respectively, which of the following statements is correct
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The energy required to knock out the electron in the third orbit of a hydrogen atom is equal to
The energy required to knock out the electron in the third orbit of a hydrogen atom is equal to
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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
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-General
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In the Bohr's hydrogen atom model, the radius of the stationary orbit is directly proportional to (n = principle quantum number)
In the Bohr's hydrogen atom model, the radius of the stationary orbit is directly proportional to (n = principle quantum number)
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If the potential difference between the anode and cathode of the X-ray tube is increases
If the potential difference between the anode and cathode of the X-ray tube is increases
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Two large parallel plates are connected with the terminal of 100 V power supply. These plates have a fine hole at the centre. An electron having energy 200 eV is so directed that it passes through the holes. When it comes out it's de-Broglie wavelength is
Two large parallel plates are connected with the terminal of 100 V power supply. These plates have a fine hole at the centre. An electron having energy 200 eV is so directed that it passes through the holes. When it comes out it's de-Broglie wavelength is
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Light of wavelength 2475 Å is incident on barium. Photoelectrons emitted describe a circle of radius 100 cm by a magnetic field of flux density 
Tesla. Work function of the barium is (Given 
Light of wavelength 2475 Å is incident on barium. Photoelectrons emitted describe a circle of radius 100 cm by a magnetic field of flux density Tesla. Work function of the barium is (Given
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If a voltage applied to an X-ray tube is increased to 1.5 times the minimum wavelength 
of an X-ray continuous spectrum shifts by 
. The initial voltage applied to the tube is
If a voltage applied to an X-ray tube is increased to 1.5 times the minimum wavelength of an X-ray continuous spectrum shifts by . The initial voltage applied to the tube is
Physics-General
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The figure shows different graphs between stopping potential 
and frequency (n) for photosensitive surface of cesium, potassium, sodium and lithium. The plots are parallel. Correct ranking of the targets according to their work function greatest first will be
The figure shows different graphs between stopping potential and frequency (n) for photosensitive surface of cesium, potassium, sodium and lithium. The plots are parallel. Correct ranking of the targets according to their work function greatest first will be
Physics-General
