The energy of the emitted photon when an electron in Be3+ ion returns from n=2 level to the ground state is 

1. 2.616 x 10-17J

2. 26.16 x 10-17J

3. 261.6 x 10-18J

4. 2616 x 10-17J

Subtopic:  Bohr's Theory |
 61%
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The accelerating potential to be imparted to a beam of electrons to give an effective wavelength of 2.42 nm is 

1. 2.56V

2. 3.42V

3. 0.256V

4. 0.342V

Subtopic:  Electromagnetic Radiation |
 53%
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The splitting of spectral lines in a magnetic field, arising out of the orbital motion of electrons only and the further splitting due to spin motion are respectively called

1. Zeeman and Stark effects

2. Zeeman and anomalous Zeeman effects

3. Stark and Zeeman effects

4. Zeeman and Kerr effects

Subtopic:  Type of Spectra |
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A photon of wavelength 300 nm causes the emission of two photons. If the wavelength of one of them is 700 nm. What is the wavelength of the other photon?

1. 525 nm

2. 600 nm

3. 450 nm

4. 300 nm

Subtopic:  Electromagnetic Radiation |
 67%
From NCERT
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The electronic transition in the hydrogen atom that emits maximum energy is:

1. 2  1

2. 1  4

3. 4  3

4. 3  2

Subtopic:  Hydrogen Spectra |
 65%
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The spectrum of He-atom may be considered similar to the spectrum of - 

1. H

2. Li+

3. Na

4. He+

Subtopic:  Hydrogen Spectra |
 75%
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The frequency ratio between violet (400nm) and red (750nm) radiations in the visible spectrum, is-

1. 8/15

2. 4/15

3. 15/8

4. None of these

Subtopic:  Electromagnetic Radiation |
 77%
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The Compton wavelength for an electron is  hm0c

0.024 Å 

calculate λhm0c(1- cos θ) for a scattering angle  θ = π/3. What is the maximum value for λ ?

1. 0.024 Å, 0.048 Å

2. 0.012 Å, 0.048 Å

3. 0.012 Å, 0.024 Å

4. 0.006 Å, 0.012 Å

Subtopic:  Electromagnetic Radiation |
 53%
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Positronium is an unstable complex of electron and positron, both of the same mass, but opposite charge. Apply Bohr's theory of hydrogen atom to this system and obtain the energy required to separate the electron from the positron.

(ionization energy of the ground state hydrogen atom= 13.62eV.) Express the result in KJmol-1

1. 550 KJmol-1

2. 657 KJmol-1

3. 851 KJmol-1

4. 720 KJmol-1

 60%
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The total spin resulting for a 3d7 configuration is 

1. 3/2

2. 1/2

3. 2

4. 1

Subtopic:  Quantum Numbers & Schrodinger Wave Equation |
 64%
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