The energy of a hydrogen atom in its ground state is —13.6 eV. The energy of the level corresponding to the quantum number n = 2 (first excited state) in the hydrogen atom is:

1. -2.72 eV

2. - 0.85 eV

3. -0.54 eV

4. — 3.4 eV

 

Subtopic:  Bohr's Model of Atom |
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Magnetic moment due to the motion of the electron in nth  energy state of a hydrogen atom is proportional to

1.  n

2.  n0 

3.  n5  

4.  n3

Subtopic:  Bohr's Model of Atom |
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When the electron of a hydrogen-like atom jumps from a higher energy level to a lower energy level, then,

1.  the angular momentum of the electron remains constant.

2.  the kinetic energy of the electron increases.

3.  the wavelength of the de-Broglie wave associated with the motion of the electron increases.

4.  the potential energy increases.

Subtopic:  Bohr's Model of Atom |
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The frequency Of radiation emitted during the transition of an electron from a second excited state to a first excited state in H-atom is f0. The frequency of the same transition emitted by a singly ionized He ion is

1.  2f0 

2.  4f0  

3.  f02  

4.  f04

Subtopic:  Bohr's Model of Atom |
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The longest and shortest wavelength of the Lyman series are (respectively)

1.  1215 A0, 500 A0   

2.  1215 A0, 912 A0  

3.  912 A0, 500 A0   

4.  912 A0, 700 A0

Subtopic:  Spectral Series |
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The ratio of wavelengths of the last line of Balmer series and the last line of Lyman series is: 

(1) 2

(2) 1

(3) 4

(4) 0.05

Subtopic:  Spectral Series |
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NEET - 2017
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Given the value of Rydberg constant is 107 m-1, the wave number of the last line of the Balmer series in hydrogen spectrum will be:

(a) 0.5×107m-1        (b) 0.25×107m-1

(c) 2.5×107m-1        (d) 0.025×104m-1

Subtopic:  Spectral Series |
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NEET - 2016
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Considering the 3rd orbit of He+ (Helium ion), using the non-relativistic approach, the speed of the electron in this orbit will be: (Given: Z=2, K=9x109, and Planck's constant, h=6.6x10-34 J-s)
1. 2.92x108 m/s
2. 1.46x106 m/s
3. 0.73x108 m/s
4. 3.0x108 m/s

Subtopic:  Bohr's Model of Atom |
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NEET - 2015
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A monochromatic radiation of λ=975 Å excites a hydrogen atom in its ground state. The number of spectral lines in the resulting spectrum emitted will be:
1. 3

2. 2

3. 6

4. 10

Subtopic:  Spectral Series |
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NEET - 2014
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Electron in hydrogen atom first jumps from third exicted state to second exicted state and then from second exicted to the first excited state. The ratio of the wavelengths λ1:λ2 emitted in the two cases is

(1) 7/5

(2) 27/20

(3) 27/5

(4) 20/7

Subtopic:  Bohr's Model of Atom |
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NEET - 2012
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