Which one of the following statements is not true:

1. The sizes of the atoms taken in Thomson's model and Rutherford's model have the same order of magnitude.
2. In the ground state of Thomson's model, the electrons are in stable equilibrium. However, in Rutherford's model, the electrons always experience a net force.
3. A classical atom based on Thomson's model is doomed to collapse.
4. The positively charged part of the atom possesses most of the mass in both the models.
Subtopic:  Various Atomic Models |
From NCERT
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What is the shortest wavelength present in the Paschen series of spectral lines?
1. \(818.9~\text{nm}\)
2. \(779~\text{nm}\)
3. \(500~\text{nm}\)
4. \(1024~\text{nm}\)

Subtopic:  Spectral Series |
 73%
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A difference of \(2.3\) eV separates two energy levels in an atom. What is the frequency of radiation emitted when the atom makes a transition from the upper level to the lower level?
1. \(6.6\times10^{14}\) Hz
2. \(5.6\times10^{14}\) Hz
3. \(9.3\times10^{14}\) Hz
4. \(7.9\times10^{14}\) Hz

Subtopic:  Spectral Series |
 74%
From NCERT
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The ground state energy of the hydrogen atom is –13.6 eV. What is the potential energy of the electron in this state?

1. -13.6 eV
2. 27.2 eV
3. -27.2 eV
4. 13.6 eV

Subtopic:  Bohr's Model of Atom |
 69%
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The radius of the innermost electron orbit of a hydrogen atom is \(5.3\times10^{-11}\) m. What is the radius of the \(n=2\) orbit?
1. \(1.67\) \(\mathring A\)
2. \(4.77\) \(\mathring A\)
3. \(2.12\) \(\mathring A\)
4. \(3.11\)
\(\mathring A\)

Subtopic:  Bohr's Model of Atom |
 78%
From NCERT
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A hydrogen atom initially in the ground level absorbs a photon, which excites it to the \(n=4\) level. The wavelength of photon is:
1. \(97\) nm
2. \(99\) nm
3. \(95\) nm
4.
 \(96\) nm

Subtopic:  Spectral Series |
 55%
From NCERT
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The speed of the electron in a hydrogen atom in the \(\mathrm{n=1}\) level is:
1. \(1.1 \times10^{6} \) m/s
2. \(2.18 \times10^{6} \) m/s
3. \(1.08\times10^{6} \) m/s
4. \(3.07 \times10^{6} \) m/s

Subtopic:  Bohr's Model of Atom |
 83%
From NCERT
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In accordance with Bohr’s model, what is the quantum number that characterizes the earth’s revolution around the sun in an orbit of radius 1.5×1011 m  with orbital speed 3×104 m/s(Mass of earth = 6.0×1024 kg.)

1.  
\(1.8\times 10^{76}\)
2. \(2.3 \times10^{74} \)
3. \(1.3 \times10^{76} \)
4. \(2.6 \times10^{74} \)

Subtopic:  Bohr's Model of Atom |
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The total energy of an electron in the first excited state of the hydrogen atom is about \(-3.4\) eV. What is the kinetic energy of the electron in this state?
1. \(3.4\) eV
2. \(-3.4\) eV
3. \(3.2\) eV
4. \(-3.2\) eV

Subtopic:  Bohr's Model of Atom |
 86%
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The total energy of an electron in the first excited state of the hydrogen atom is about -3.4 eV. What is the potential energy of the electron in this state?

1. 6.8 eV
2. -6.8 eV
3. 0
4. 3.4 eV

Subtopic:  Bohr's Model of Atom |
 77%
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