For which one of the following Bohr model is not valid?

1. Singly ionised helium atom He+

2. Deuteron atom

3. Singly ionised neon atom Ne+

4. Hydrogen atom

Subtopic:  Bohr's Model of Atom |
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The total energy of an electron in the nth stationary orbit of the hydrogen atom can be obtained by:

1.  En = 13.6n2 eV

2.  En =  -13.6n2 eV

3.  En = - 1.36n2 eV

4.  En = -13.6×n2 eV

Subtopic:  Bohr's Model of Atom |
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The total energy of an electron in the orbit of an atom is -3.4 eV. Its kinetic and potential energies are, respectively:

1. 3.4 eV, 3.4 eV

2. -3.4 eV, -3.4 eV

3. -3.4 eV, -6.8 eV

4. 3.4 eV, -6.8 eV

Subtopic:  Bohr's Model of Atom |
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α-particle consists of:

1. 2 protons only

2. 2 protons and 2 neutrons only

3, 2 electrons, 2 protons, and 2 neutrons

4. 2 electrons and 4 protons only

Subtopic:  Various Atomic Models |
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The radius of the first permitted Bohr orbit for the electron in a hydrogen atom equals 0.5 Ao and its ground state energy equals -13.6 eV. If the electron in the hydrogen atom is replaced by muon (μ-) [ charge same as electron and mass 207me], the first Bohr radius and ground state energy will be-   (me represents mass of electron)

1. 0.53 ×10-13 m, -3.6 eV

2. 25.6 ×10-13 m, -2.8 eV

3. 2.56 ×10-13 m, -2.8 keV

4. 2.56×10-13 m, -13.6 eV

Subtopic:  Bohr's Model of Atom |
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The ratio of kinetic energy to the total energy of an electron in a Bohr orbit of the hydrogen atom is:

1. 1 : 1

2. 1 : -1

3. 2 : -1

4. 1 : -2

Subtopic:  Bohr's Model of Atom |
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The ratio of wavelengths of the last line of Balmer series and the last line of Lyman series is:-

1. 1

2. 4

3. 0.5

4. 2

Subtopic:  Spectral Series |
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Electrons of mass m with de- Broglie wavelength λ fall on the target in an X-ray tube. The cut-off wavelength (λo) of the emitted X-ray is :

1.  λ0=2mcλ2h

2.  λ0=2hmc

3.  λ0=2m2c2λ2h2

4.  λ0=λ

Subtopic:  X-Ray |
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If an electron in a hydrogen atom jumps from the 3rd orbit to the 2nd orbit, it emits a photon of wavelength λ. When it jumps from the 4th orbit to the 3rd orbit, the corresponding wavelength of the photon will be

1.  1625λ

2.  916λ

3.  207λ

4.  2013λ

Subtopic:  Bohr's Model of Atom |
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Given that the value of the Rydberg constant is 107 m-1, what will be the wave number of the last line of the Balmer series in the hydrogen spectrum?
1. \(0.5 \times 10^{7} ~m^{-1}\)
2. \(0.25 \times 10^{7} \mathrm{~m}^{-1}\)
3. \(2.5 \times 10^{7} \mathrm{~m}^{-1}\)
4. \(0.025 \times 10^{4} ~m^{-1}\)

Subtopic:  Spectral Series |
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