Be3+ion and a proton are accelerated by the same potential. The ratio of their de-Broglie wavelengths is

(assume mass of proton =  mass of neutron)

1. 1:2

2. 1:4

3. 1:1

4. 1:33

Subtopic:  Bohr's Theory |
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The incorrect statement about the nodal plane among the following is: 

1. A plane on which there is a zero probability of finding an electron.
2. A plane on which there is maximum probability that the electron will be found.
3. ψ2 is  zero at nodal plane.
4. None of the above.

Subtopic:  Nodal Plane |
 75%
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The quantum number not obtained from Schrodinger’s wave equation is:

1. \(n\) 2. \(l\)
3. \(m\) 4. \(s\)
Subtopic:  Quantum Numbers & Schrodinger Wave Equation |
 83%
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Photons of wavelength 4000  Ao are used to break l2 molecules. The percentage of energy converted to the kinetic energy of atoms will be :

(bond dissociation energy of the molecule is 246.5 kJ/mol)

1.  12%

2.  8%

3.  26%

4.  17%

Subtopic:  Electromagnetic Radiation |
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A photon with an initial frequency of \(10^{11}~\mathrm{Hz}\) scatters off an electron at rest. Its final frequency is \(0.9 \times10^{11}~\mathrm{Hz}.\) The speed of scattered electron is close to: 

1. \(3 \times10^{2}~\mathrm{ms}^{-1}\) 2. \(3.8 \times10^{3}~\mathrm{ms}^{-1}\)
3. \(2 \times10^{6}~\mathrm{ms}^{-1}\) 4. \(30~\mathrm{ms}^{-1}\)

Subtopic:  Photo Electric Effect |
 64%
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In the transition of an electron in an atom, its kinetic energy changes from y to y4. The change in potential energy will be -

1. \(\frac{-3}{8} y\)
2. \({{3}\over{2}}y\)
3. \({{3}\over{4}}y\)
4. \(-{{3}\over{4}}y\)

Subtopic:  Bohr's Theory |
 58%
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The wavelength of the spectral line obtained in the spectrum of Li+2
when the transition takes place between levels whose sum is 4 and the difference is 2, will be:

1.  11.4 x 10-6 cm

2.  1.14 x 10-6cm

3.  0.114 x 10-6 cm

4.  1.14 x 10-8 cm

Subtopic:  Hydrogen Spectra |
 62%
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The charge on the electron and proton are reduced to 23rd of their original values. Let the present value of the Rydberg constant of H-atom be R, then the new value of the Rydberg constant will be

1.  2R3
2.  4R9
3.  8R27
4.  16R81

Subtopic:  Bohr's Theory |
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The wavelength of a certain line in the Balmer series is observed to be 4341 Afor hydrogen atoms.
The electronic transition among the following may be:

1. 3 → 2
2. 4 → 1
3. 5 → 2
4. 5 → 3

Subtopic:  Bohr's Theory |
 58%
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In a subshell, if the number of radial nodes is two times the number of angular nodes, then the minimum possible value of the principal quantum number (n) is: 

[angular nodes are non-zero)

1. 1 2. 2
3. 3 4. 4
Subtopic:  Nodal Plane |
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