The energy associated with the fifth orbit of a hydrogen atom is :

1. -2.18 × 10-18 J
2. -8.72 × 10-20 J
3. -3.88 × 10-21 J
4. -8.72 × 10-19 J

Subtopic:  Hydrogen Spectra |
 70%
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The wave number for the longest wavelength transition in the Balmer series of atomic hydrogen would be -
1. \(1 .   1 . 52   \times   \left(10\right)^{6}   m^{- 1}\)
2. \(2 .   3 . 14   \times   \left(10\right)^{6}   \left(cm\right)^{- 1}\)
3. \(3 .   15 . 2   \times   \left(10\right)^{6}   m^{- 1}\)
4. \(4 .   1 . 52   \times   \left(10\right)^{6}   \left(cm\right)^{- 1}\)



 

Subtopic:  Hydrogen Spectra |
 61%
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The energy of an electron in an H - atom is given by \(E_n=(-2.18 \times10^{-18})/n^2~\mathrm J.\) The shortest wavelength of light that can be used to remove an electron completely from \(n = 2\) orbit will be:

1. \(3647~\mathring{\mathrm A}\) 2. \(5132~\mathring{\mathrm A}\)
3. \(3017~\mathring{\mathrm A}\) 4. None of these

Subtopic:  Hydrogen Spectra |
 62%
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The wavelength of an electron moving with a velocity of 2.05 × 107 m s-1  would be:  

\(1 .\) \(4 . 65\) \(\times\) \(\left(10\right)^{- 12}\) \(m\)

\(2 .\) \(3 . 55\) \(\times\) \(\left(10\right)^{-11}\) \(m\)

\(3 .\) \(2 . 34\) \(\times\) \(\left(10\right)^{11}\) \(m\)

\(4 .\) \(6 . 43\) \(\times\) \(\left(10\right)^{ -11}\) \(m\)

Subtopic:  De Broglie Equation |
 78%
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The kinetic energy of an electron is \(3.0 \times 10^{-25}~ \mathrm J.\) Its wave length would be: 

1. \(8.96 \times 10^{-7}~ \mathrm m\) 2. \(4.37 \times 10^{-6}~ \mathrm m\)
3. \(1.32 \times 10^{-7}~ \mathrm m\) 4. \(2.89 \times 10^{-4}~ \mathrm m\)
Subtopic:  De Broglie Equation |
 55%
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The lowest value of n for 'g' orbitals is :
1. 4
2. 5
3. 3
4. 1

Subtopic:  Shell & Subshell |
 72%
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An atom of an element contains 29 electrons and 35 neutrons. The number of protons in the element would be:

1. 29 2. 35
3. 6 4. 64
Subtopic:  Number of Electron, Proton & Neutron |
 83%
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If the diameter of a carbon atom is 0.15 nm, the number of carbon atoms that can be placed side by side in a straight line across the length of the scale of length 20 cm long will be:

1. 1.33 × 107 2. 5.46 × 108
3. 1.33 × 109 4. 2.36 × 108


Subtopic:  Introduction of Atomic Structure |
 70%
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The charge on the oil drop is –1.282 × 10–18C. The number of electrons present in it would be :

1. 15

2. 8

3. 2

4. 6

Subtopic:  Number of Electron, Proton & Neutron |
 81%
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An element with a mass number of 81 contains 31.7% more neutrons as compared to protons. The atomic symbol of the element would be

1. Br3581
2. Br3681
3. Br3579
4. Br3679

Subtopic:  Number of Electron, Proton & Neutron |
 67%
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