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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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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The transition from the state n=3 to n=1

a hydrogen like atom results in ultraviolet

radiation. Infrared radiation will be obtained

in the transition from

(a) 21

(b) 32

(c) 42

(d) 43

Subtopic:  Spectral Series |
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NEET - 2012
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An electron in the hydrogen atom jumps from nth excited state to the ground state. The wavelength so emitted illuminates a photosensitive material having work function 2.75 eV. If the stopping potential of the photo-electron is 10V, the value of n is 

(1) 3

(2) 4

(3) 5

(4) 2

Subtopic:  Bohr's Model of Atom |
From NCERT
NEET - 2011
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An alpha nucleus of energy 12mv2 bombards a heavy nuclear target of charge Ze. Then the distance of closest approach for the alpha nucleus will be proportional to

(a) 1Ze                              (b) v2

(c) 1m                               (d) 1v4

Subtopic:  Various Atomic Models |
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The electron in the hydrogen atom jumps from excited state n=3 to its ground state n=1 and the photons thus emitted irradiate a photosensitive material. If the work function of the material is 5.1 eV, the stopping potential is estimated to be (the energy of the electron in the nth state En=-13.6n2eV)

1. 5.1 V                                               

2. 12.1 V

3. 17.2 V                                             

4. 7 V

Subtopic:  Bohr's Model of Atom |
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In the phenomenon of electric discharge through gases at low pressure, the coloured glow in the tube appears as a result of:

(1) excitation of electrons in the atoms 

(2) the collision between the atoms of the gas 

(3) the collisions between the charged particles emitted from the cathode and the atoms of the gas 

(4) the collision between different electrons of the atoms of the gas 

Subtopic:  X-Ray (OLD NCERT) |
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NEET - 2008
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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 (OLD NCERT) |
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NEET - 2016
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If an electron in a hydrogen atom jumps from the \(3^{\text{rd}}\) orbit to the \(2^{\text{nd}}\) orbit, it emits a photon of wavelength \(\lambda\). When it jumps from the \(4^{\text{th}}\) orbit to the \(3^{\text{rd}}\) orbit, the corresponding wavelength of the photon will be:

1. \(\frac{16}{25}\lambda\) 2. \(\frac{9}{16}\lambda\)
3. \(\frac{20}{7}\lambda\) 4. \(\frac{20}{13}\lambda\)
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 |
 75%
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NEET - 2017
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