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प्रश्न
State three postulates of Bohr's theory of hydrogen atom.
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उत्तर
Neil Bohr's major three postulates about Bohr's model of the hydrogen atom are:
- Atoms contain a number of stable orbits in which electrons can live without producing energy; each orbit corresponds to a specific amount of energy.
- When an electron jumps from one orbit to another, there is an energy difference equal to E = nhν because the energy of the outer orbit is greater than the energy of the inner orbit.
- The angular momentum of the electron is quantized which can be shown as:
L = `(nh)/(2pi)`, where n = 1, 2, 3, ..........
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संबंधित प्रश्न
Obtain an expression for the radius of Bohr orbit for H-atom.
Explain, giving reasons, which of the following sets of quantum numbers are not possible.
- n = 0, l = 0, ml = 0, ms = + ½
- n = 1, l = 0, ml = 0, ms = – ½
- n = 1, l = 1, ml = 0, ms = + ½
- n = 2, l = 1, ml = 0, ms = – ½
- n = 3, l = 3, ml = –3, ms = + ½
- n = 3, l = 1, ml = 0, ms = + ½
The radius of the innermost electron orbit of a hydrogen atom is 5.3 × 10−11 m. What are the radii of the n = 2 and n = 3 orbits?
State Bohr postulate of hydrogen atom that gives the relationship for the frequency of emitted photon in a transition.
Calculate the magnetic dipole moment corresponding to the motion of the electron in the ground state of a hydrogen atom.
The light emitted in the transition n = 3 to n = 2 in hydrogen is called Hα light. Find the maximum work function a metal can have so that Hα light can emit photoelectrons from it.
Radiation from hydrogen discharge tube falls on a cesium plate. Find the maximum possible kinetic energy of the photoelectrons. Work function of cesium is 1.9 eV.
If l3 and l2 represent angular momenta of an orbiting electron in III and II Bohr orbits respectively, then l3: l2 is :
How are various lines of Lyman series formed? Explain on the basis of Bohr’s theory.
The Bohr model for the spectra of a H-atom ______.
- will not be applicable to hydrogen in the molecular from.
- will not be applicable as it is for a He-atom.
- is valid only at room temperature.
- predicts continuous as well as discrete spectral lines.
