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The binding energy of a H-atom, considering an electron moving around a fixed nuclei (proton), is B = - (me^4)/(8n^2ε_0^2h^2).

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प्रश्न

The binding energy of a H-atom, considering an electron moving around a fixed nuclei (proton), is B = `- (Me^4)/(8n^2ε_0^2h^2)`. (m = electron mass). If one decides to work in a frame of reference where the electron is at rest, the proton would be moving around it. By similar arguments, the binding energy would be

B = `- (Me^4)/(8n^2ε_0^2h^2)` (M = proton mass)

This last expression is not correct because ______.

विकल्प

  • n would not be integral.

  • Bohr-quantisation applies only to electron

  • the frame in which the electron is at rest is not inertial.

  • the motion of the proton would not be in circular orbits, even approximately.

MCQ
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उत्तर

The binding energy of a H-atom, considering an electron moving around a fixed nuclei (proton), is B = `- (Me^4)/(8n^2ε_0^2h^2)`. (m = electron mass). If one decides to work in a frame of reference where the electron is at rest, the proton would be moving around it. By similar arguments, the binding energy would be

B = `- (Me^4)/(8n^2ε_0^2h^2)` (M = proton mass)

This last expression is not correct because the frame in which the electron is at rest is not inertial.

Explanation:

In a hydrogen atom, electrons revolving around a fixed proton nucleus have some centripetal acceleration. Therefore its frame of reference is non-inertial. If the frame of reference, where the electron is at rest, the given expression is not true as it forms the non-inertial frame of reference.

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अध्याय 12: Atoms - Exercises [पृष्ठ ७५]

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एनसीईआरटी एक्झांप्लर Physics Exemplar [English] Class 12
अध्याय 12 Atoms
Exercises | Q 12.02 | पृष्ठ ७५

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संबंधित प्रश्न

Draw a neat, labelled energy level diagram for H atom showing the transitions. Explain the series of spectral lines for H atom, whose fixed inner orbit numbers are 3 and 4 respectively.


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In Bohr’s model of the hydrogen atom, the radius of the first orbit of an electron is r0 . Then, the radius of the third orbit is:

a) `r_0/9`

b) `r_0`

c) `3r_0`

d) `9r_0`


if `E_p` and `E_k` represent potential energy and kinetic energy respectively, of an orbital electron, then, according to B9hr's theory:

a)`E_k = -E_p"/"2`

b) `E_k = -E_p`

c) `E_k = -2E_p`

d) `E_k = 2E_p`

 


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