The transition zone for Raman spectra is __________

Between vibrational and rotational levels

Between magnetic levels of nuclei

Between magnetic levels of unpaired electrons

Luminescence is because of

Photons emitted while excited electrons drops down

Knocking out of electrons by photons

Physics Quiz For B.Sc.

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Quizzes Created: 1 | Total Attempts: 769

Questions: 10 | Attempts: 772 | Updated: Mar 21, 2023

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B. Sc. Second year physics quiz last date 24-05-2020
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Questions and Answers

1.

The elepticall orbit concept was proposed by?
- A.
  
  Bohr
- B.
  
  Rutherford
- C.
  
  Summerfeld
- D.
  
  Einstien
Correct Answer
A. Bohr

Explanation
Bohr proposed the concept of elliptical orbits in his model of the atom. He suggested that electrons revolve around the nucleus in specific energy levels, and these orbits are elliptical in shape. This model was a significant advancement in understanding the behavior of electrons and their distribution within an atom. Rutherford, Sommerfeld, and Einstein made other important contributions to atomic theory but did not specifically propose the concept of elliptical orbits.

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4
1
2.

If 13.6 eV energy is required to ionise the hydrogen atom, then energy required to remove an electron from n = 2 is
- A.
  
  10.2 eV
- B.
  
  0 eV
- C.
  
  3.4 eV
- D.
  
  6.8 eV.
Correct Answer
C. 3.4 eV

Explanation
When the energy required to ionize the hydrogen atom is given as 13.6 eV, it means that this is the energy required to completely remove an electron from the atom when it is in the ground state (n = 1). In order to remove an electron from the n = 2 energy level, the energy required would be less than the ionization energy. Since the energy levels of hydrogen are quantized, the energy required to remove an electron from n = 2 would be lower than the ionization energy, but not zero. Therefore, the correct answer is 3.4 eV, which is less than 13.6 eV but greater than zero.

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0
3.

In Bohr’s model of an atom which of the following is an integral multiple of h/2π?
- A.
  
  Kinetic energy
- B.
  
  Radius of an atom
- C.
  
  Potential energy
- D.
  
  Angular momentum
Correct Answer
D. Angular momentum

Explanation
(d) Angular momentum L = mvr = nh/2π

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4.

The K.E. of the electron in an orbit of radius r in hydrogen atom is proportional to
- A.
  
  E²/r
- B.
  
  E²/2r
- C.
  
  2e²/r
- D.
  
  E²/4r
Correct Answer
A. E²/r

Explanation
(b) e2/r , since K.E = ke2/2r

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1
0
5.

The correct order of different types of energies is __________
- A.
  
  E_el>> E_vib >> E_rot >> E _tr
- B.
  
  E_el >> E_rot >> E_vib >> E _tr
- C.
  
  E_el >> E_vib >> E_tr >> E _rot
- D.
  
  E_el >> E_vib >> E_tr >> E _rot
Correct Answer
A. E_el>> E_vib >> E_rot >> E _tr

Explanation
The correct order of different types of energies is Eel (electrical energy), Evib (vibrational energy), Erot (rotational energy), and Etr (translational energy). This order is based on the hierarchy of energy types, where electrical energy is the highest in the hierarchy, followed by vibrational, rotational, and translational energy.

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6.

The different types of energies associated with a molecule are __________
- A.
  
  Electronic energy
- B.
  
  Vibrational energy
- C.
  
  Rotational energy
- D.
  
  All of the above
Correct Answer
D. All of the above

Explanation
Molecule has all types of energy

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7.

The transition zone for Raman spectra is __________
- A.
  
  Between vibrational and rotational levels
- B.
  
  Between magnetic levels of nuclei
- C.
  
  Between electronic levels
- D.
  
  Between magnetic levels of unpaired electrons
Correct Answer
A. Between vibrational and rotational levels

Explanation
The transition zone for Raman spectra refers to the region between vibrational and rotational levels. Raman spectroscopy involves the interaction of light with molecular vibrations, causing a shift in energy levels. Vibrational levels correspond to the different vibrational states of a molecule, while rotational levels correspond to the different rotational states. The transition zone is where the energy changes from predominantly vibrational to predominantly rotational, and this is where Raman scattering occurs.

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8.

Luminescence is because of
- A.
  
  Photons emitted while excited electrons drops down
- B.
  
  Knocking out of electrons by photons
- C.
  
  Photons stimulated by photons
- D.
  
  All
Correct Answer
A. Photons emitted while excited electrons drops down

Explanation
Luminescence occurs when excited electrons return to their ground state, releasing photons in the process. This phenomenon is known as fluorescence or phosphorescence, depending on the duration of the emitted light. When electrons are excited to higher energy levels, they eventually drop back down to their original energy level, emitting photons in the process. This is the most common explanation for luminescence and is the correct answer in this case.

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9.

Visible light’s wavelength range ______________.
- A.
  
  0.39 – 0.77 mm
- B.
  
  0.39 – 0.77 µm
- C.
  
  0.39 – 0.77 nm
- D.
  
  0.39 – 0.77 cm
Correct Answer
B. 0.39 – 0.77 µm

Explanation
Visible light's wavelength range is typically measured in micrometers (µm), which is the correct answer given. The range of 0.39 - 0.77 µm corresponds to the wavelengths of light that are visible to the human eye, with shorter wavelengths appearing as violet and longer wavelengths appearing as red.

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10.

Proton has the charge
- A.
  
  1637 times of an electron
- B.
  
  1737 times of an electron
- C.
  
  1837 times of an electron
- D.
  
  1937 times of an electron
Correct Answer
B. 1737 times of an electron

Explanation
The charge of a proton is 1737 times that of an electron. This is because the proton carries a positive charge, while the electron carries a negative charge. The ratio of their charges is determined by the fundamental properties of these particles.

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May 22, 2020

Quiz Created by
Pramodh B

Physics Quiz For B.Sc.

The elepticall orbit concept was proposed by?

If 13.6 eV energy is required to ionise the hydrogen atom, then energy required to remove an electron from n = 2 is

In Bohr’s model of an atom which of the following is an integral multiple of h/2π?

The K.E. of the electron in an orbit of radius r in hydrogen atom is proportional to

The correct order of different types of energies is __________

The different types of energies associated with a molecule are __________

The transition zone for Raman spectra is __________

Luminescence is because of

Visible light’s wavelength range ______________.

Proton has the charge