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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Let T1 and T2 be the energy of an electron in the first and second excited states of hydrogen atom, respectively. According to Bohr's model of an atom, the ratio T1 : T2 is:
1.  9:4 
2.  1:4 
3.  4:1 
4.  4:9
Subtopic:  Bohr's Model of Atom |
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Let L1 and L2 be the orbital angular momentum of an electron in the first and second excited states of the hydrogen atom, respectively. According to Bohr's model, the ratio L1:L2 is:
1.  1:2
2.  2:1
3.  3:2
4.  2:3

Subtopic:  Bohr's Model of Atom |
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Let R1 be the radius of the second stationary orbit and R2 be the radius of the fourth stationary orbit of an electron in Bohr's model. The ratio \(\frac{R_1}{R_2}\) is:
1.  0.25
2.  0.5
3.  2
4.  4
Subtopic:  Bohr's Model of Atom |
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NEET MCQ Books for 11th Physics, Chemistry & Biology