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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An electron of a stationary hydrogen atom passes from the fifth energy level to the ground level. The velocity that the atom acquires as a result of photon emission will be:
(m is the mass of the hydrogen atom, R Rydberg constant and h Planck's constant)

1. \(\frac{24   h R}{25   m}\)

2. \(\frac{25   h R}{24 m}\)

3. \(\frac{25 m}{24 h R}\)

4. \(\frac{24 m}{25 h R}\)

Subtopic:  Bohr's Model of Atom |
 64%
From NCERT
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 |
 73%
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NEET - 2012
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The wavelength of the first line of Lyman series for hydrogen atom is equal to that of the second line of Balmer series for a hydrogen-like ion. The atomic number Z of hydrogen-like ion is: 

(1) 4                                                 

(2) 1

(3) 2                                                 

(4) 3

Subtopic:  Spectral Series |
 69%
From NCERT
NEET - 2011
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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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The energy of a hydrogen atom in the ground state is \(-13.6~\mathrm{eV}\). What is the energy of a He+ ion in the first excited state?

1. -13.6 eV

2. -27.2 eV

3. -54.4 eV

4. -6.8 eV

Subtopic:  Bohr's Model of Atom |
 73%
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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 |
 79%
From NCERT
NEET - 2010
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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 a Rutherford scattering experiment when a projectile of charge Z1 and mass M1 approaches a target nucleus of charge Z2 and mass M2, the distance of closest approach is r0. What is the energy of the projectile?

1. Directly proportional to \(M_1 \times M_2\)
2. Directly proportional to \(Z_1Z_2\)
3. Inversely proportional to \(Z_1\)
4. Directly proportional to mass \(M_1\)

Subtopic:  Various Atomic Models |
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The ionization energy of the electron in the hydrogen atom in its ground state is 13.6 eV. The atoms are excited to higher energy levels to emit radiations of 6 wavelengths. Maximum wavelength of emitted radiation corresponds to the transition between

(a) n=3 to n=2 states

(b) n=3 to n=1 states

(c) n=2 to n=1 states

(d) n=4 to n=3 states

Subtopic:  Spectral Series |
 59%
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