The frequency of radiation emitted when the electron falls from n = 4 to n = 1 in a hydrogen atom will be:
(Given ionization energy of H = 2.18 × 10–18 J atom –1 and h = 6.625 × 10–34 Js):

1. 1.03 × 1015 s–1

2. 3.08 × 1015 s–1

3. 2.00 × 1015 s–1

4. 1.54 × 1015 s–1

Subtopic:  Hydrogen Spectra |
 71%
From NCERT
AIPMT - 2004
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The value of Planck's constant is 6.63 × 10–34 J s. The velocity of light is 3.0 × 108 m s–1. The closest value to the wavelength in nanometers of a quantum of light with a frequency of 8×1015 s-1 is:

1. 2×10-25

2. 5×10-18

3. 4×101

4. 3×107

Subtopic:  Planck's Theory |
 56%
From NCERT
AIPMT - 2003
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The number of orbitals indicated by the following set of quantum numbers, n = 3, l = 2, m =+2 is:

1.  1

2.  2

3.  3

4.  4

Subtopic:  Quantum Numbers & Schrodinger Wave Equation |
 71%
From NCERT
AIPMT - 2001
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Ionization energy of second orbit of Li+2 will be:
1.  122.4 eV
2.  40.8 eV
3.  30.6 eV
4.  13.6 eV

Subtopic:  Bohr's Theory |
 67%
From NCERT
AIPMT - 1999
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Uncertainty in position of a e- and He is similar. If uncertainty in momentum of e- is 32×105, then uncertainty in momentum of He will be:

1. 32×105 2. 16×105
3. 8×105 4. None of the above
Subtopic:  Heisenberg Uncertainty Principle |
 78%
From NCERT
AIPMT - 1998
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The radius of a hydrogen shell is 0.53Å. In its first excited state, radius of the shell will be:
1. 2.12 Å
2. 1.06 Å
3. 8.5 Å
4. 4.24 Å

Subtopic:  Bohr's Theory |
 80%
From NCERT
AIPMT - 1998
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Which of the following molecule is not paramagnetic:
1. Cu++

2. Fe2+

3. Cl-

4. None of the above 

Subtopic:  Pauli's Exclusion Principle & Hund's Rule |
 67%
From NCERT
AIPMT - 1998
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If the energy of the second Bohr orbit of the hydrogen atom is –328 kJ mol–1, the energy of the fourth Bohr orbit would be:

1. –1312 kJ mol–1 2. –82 kJ mol–1
3. –41 kJ mol–1 4. –164 kJ mol–1
Subtopic:  Bohr's Theory |
 75%
From NCERT
AIPMT - 2005
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If the energy value is E = 3.03 × 10–19 Joules, (h = 6.6×10–34 J x sec., C = 3×108 m/sec), then the value of the corresponding wavelength is:

1. 65.3 nm 2. 6.53 nm
3. 3.4 nm 4. 653 nm
Subtopic:  Planck's Theory |
 73%
From NCERT
AIPMT - 2000
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The nuclei of which one of the following pairs are isotones:

1. \(34 \mathrm{Se}^{74},{ }_{31} \mathrm{Ga}^{71}\) 2. \({ }_{38} \mathrm{Sr}^{84},{ }_{38} \mathrm{Sr}^{86}\)
3. \({ }_{42} \mathrm{Mo}^{92},{ }_{40} \mathrm{Zr}^{92}\) 4. \({ }_{20} \mathrm{Ca}^{40},{ }_{16} \mathrm{~S}^{32}\)
Subtopic:  Number of Electron, Proton & Neutron |
 82%
From NCERT
AIPMT - 2005
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