Energy E of a hydrogen atom with principal quantum number n is given by E=-13.6n2eV.  The energy of a photon ejected when the electron jumps from n = 3 state to n = 2 state of hydrogen, is approximately [2004]

1. 1.5 eV 

2. 0.85 eV 

3. 3.4 eV 

4. 1.9 eV

Subtopic:  Bohr's Model of Atom |
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The energy of ground electronic state of hydrogen atom is -13.6 eV.  The energy of the first excited state will be [1997]

1. -54.4 eV 

2. -27.2 eV

3. -6.8 eV 

4. -3.4 eV

Subtopic:  Bohr's Model of Atom |
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The total energy of an electron in the first excited state of hydrogen is about -3.4 eV. Its kinetic energy in this state is [2005]

1. -3.4 eV

2. -6.8 eV 

3. 6.8 eV 

4. 3.4 eV

Subtopic:  Bohr's Model of Atom |
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When hydrogen atom is in its first excited level, its radius is [1997]

1. four times, its ground state radius

2. twice, its ground state radius

3. same as its ground state radius

4. half of its ground state radius

Subtopic:  Bohr's Model of Atom |
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The ionisation potential of helium atom is 24.6 volt, the energy required to ionise it will be

1. 24.6 eV 

2. 24.6 volt 

3. 13.6 volt 

4.13..6 eV

Subtopic:  Various Atomic Models |
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The ionization energy of 10 times ionized sodium atom is:

1. 13.6 eV 

2. 13.6×11 eV 

3. 13.611eV 

4. 13.6×(11)2 eV

Subtopic:  Bohr's Model of Atom |
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The ionisation energy of hydrogen atom is 13.6 eV, the ionisation energy of helium atom would be [1988]

1. 13.6 eV

2. 27.2 eV 

3. 6.8 eV

4. 54.4 eV

Subtopic:  Bohr's Model of Atom |
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The photon radiated from hydrogen corresponding to the second line of Lyman series is absorbed by a hydrogen-like atom X in the second excited state.   As a result the hydrogen-like atom X makes a transition to nth orbit. Then:

1. X = He+, n=4 

2. X = Li++, n = 6

3. X = He+, n=9 

4. X = Li++, n = 9

 

Subtopic:  Spectral Series |
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If an electron in an hydrogen atom jumps from an orbit ni=3 to an orbit with level nf=2, the frequency of the emitted radiation is 

1. v=36 C5 R 

2. v = CR6

3. v = 5 RC36

4. v  = 6 CR

Subtopic:  Bohr's Model of Atom |
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The wavenumber of a photon in the Brackett series of a hydrogen atom is 9400R. What is the quantum number of the electron that has transited from the orbit?

1. 5

2. 6

3. 4

4. 7

Subtopic:  Spectral Series |
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