The wavelength of the first spectral line in the Balmer series of hydrogen atom is 6561 A0. The wavelength of the second spectral line in the Balmer series of singly ionized helium atom is [IIT-JEE 2011]

1. 1215 A0 

2. 1640 A0

3. 2430 A0 

4. 4687 A0

Subtopic:  Spectral Series |
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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 |
 83%
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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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