Characteristic Spectrum
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Explain the energy level diagram for electronic transitions.
- its kinetic energy increases but potential energy and total energy decrease
- kinetic energy, potential energy and total energy decrease
- kinetic energy decreases, potential energy increases but total energy remains same
- kinetic energy and total energy decrease but potential energy increases
De broglie wavelength associated with an electron accelerated through a potential difference of is nearly
- A continuous X-ray spectrum (Bremsstrahlung] with all wavelengths
- The characteristic X-rays spectrum of tungsten
- A continuous X-ray spectrum (Bremsstrahlung) with a minimum wavelength of ∼0.155˙A
- A continuous X-ray spectrum (Bremsstrahlung) with a minimum wavelength of ∼0.155˙A and the characteristic X-ray spectrum of tungsten
The wavelength of Kα line from an element of atomic number 41 is λ. Then the wavelength of Kα line of an element of atomic number 21 is
4λ
λ4
3.08λ
0.26λ
An electron is accelerated from rest through a potential difference of . If the de Broglie wavelength of the electron is , the potential difference is
Explain the energy level diagram in detail.
- increases
- decreases
- decreases.
- increases.
- It may emit another photon in the Brackett series.
- It may emit another photon in the Lyman series
- It need not emit any one more photon
- It may emit another photon in the Paschen series
State the charge on an electron in coulomb.
- 1.2 MeV
- 59 KeV
- 0.51MeV
- 13.6 eV
The energy of K-alpha characteristic X-Ray is:
- Ek−El
El−Ek
Ek
El
- The arrow in the diagram represents the jump of an electron from the K shell to the L shell.
- The energy levels represent the energies of the atom when one electron is missing from respective shell.
- The energy of the atom in K shell is lesser than its energy in L shell, but the diagram shows K shell at higher energy; hence the diagram is incorrect.
- An x-ray carrying about 17 keV of energy will be radiated in the transition.
A sample of paramagnetic salt contains 2.0 × 1024 atomic dipoles each of dipole moment 1.5 × 10−23 J T−1. The sample is placed under a homogeneous magnetic field of 0.64 T, and cooled to a temperature of 4.2 K. The degree of magnetic saturation achieved is equal to 15%. What is the total dipole moment of the sample for a magnetic field of 0.98 T and a temperature of 2.8 K? (Assume Curie’s law)