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Balmer Series Was Observed and Analysed before the Other Series. Can You Suggest a Reason for Such an Order? - Physics

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प्रश्न

Balmer series was observed and analysed before the other series. Can you suggest a reason for such an order?

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उत्तर

The Balmer series lies in the visible range. Therefore, it was observed and analysed before the other series. The wavelength range of Balmer series is from 364 nm (for n2 = ∞ to 655 nm (for n=3).

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अध्याय 21: Bohr’s Model and Physics of Atom - Short Answers [पृष्ठ ३८३]

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एचसी वर्मा Concepts of Physics Vol. 2 [English] Class 11 and 12
अध्याय 21 Bohr’s Model and Physics of Atom
Short Answers | Q 5 | पृष्ठ ३८३

संबंधित प्रश्न

Calculate the radius of second Bohr orbit in hydrogen atom from the given data.

Mass of electron = 9.1 x 10-31kg

Charge on the electron = 1.6 x 10-19 C

Planck’s constant = 6.63 x 10-34 J-s.

Permittivity of free space = 8.85 x 10-12 C2/Nm2


Calculate the radius of Bohr’s fifth orbit for hydrogen atom


  1. Using the Bohr’s model, calculate the speed of the electron in a hydrogen atom in the n = 1, 2 and 3 levels.
  2. Calculate the orbital period in each of these levels.

The gravitational attraction between electron and proton in a hydrogen atom is weaker than the Coulomb attraction by a factor of about 10−40. An alternative way of looking at this fact is to estimate the radius of the first Bohr orbit of a hydrogen atom if the electron and proton were bound by gravitational attraction. You will find the answer interesting.


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`

 


Evaluate Rydberg constant by putting the values of the fundamental constants in its expression.


Calculate the magnetic dipole moment corresponding to the motion of the electron in the ground state of a hydrogen atom.


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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.


A filter transmits only the radiation of wavelength greater than 440 nm. Radiation from a hydrogen-discharge tube goes through such a filter and is incident on a metal of work function 2.0 eV. Find the stopping potential which can stop the photoelectrons.


Calculate the de-Broglie wavelength associated with the electron revolving in the first excited state of the hydrogen atom. The ground state energy of the hydrogen atom is −13.6 eV.


Why was a change in the Bohr Model of atom required? Due to which important development (s), concept of movement of an electron in an orbit was replaced by, the concept of probability of finding electron in an orbital? What is the name given to the changed model of atom?


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  1. because of energy conservation.
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  3. because of momentum conservation.
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What is the energy associated with first orbit of Li2+ (RH = 2.18 × 10-18)?


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