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Standard IX
Physics
Bohr's Model of an Atom
Select the co...
Question

Select the correct statements that are proposed by Neils Bohr regarding the model of an atom.


A

The electron can have only certain energies, including a lowest-level ground state

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B

Electrons emit energy as light when they move to lower energy orbits

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C

Electrons absorb energy by moving to higher energy orbits.

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D

All of these

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Solution

The correct option is D

All of these


Bohr's Model of an atom included the idea(s) that:

The electron can have only certain energies, including a lowest-level ground state.
Electrons emit energy as light when they move to lower energy orbits and electrons absorb energy by moving to higher energy orbits.
Mass of a proton is 1836 times the mass of an electron.


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Q. What do we mean by electrons emit energy as light when they move to lower energy orbits?
Q. (a) As long as an electron revolves in a particular orbit, the electron does not lose its energy. Therefore, these orbits are called stationary orbits and the electrons are said to be in stationary energy states.
(b) Each orbit or shell is associated with a definite amount of energy. Hence these are also called energy levels.
(c) An electron jumps from a lower energy level to a higher energy level, by absorbing energy. It jumps from a higher energy level to a lower energy level, by emitting energy in the form of electromagnetic radiation.
(d) Electrons move around the nucleus in specified circular paths called orbits or shells or energy levels and are designated as K, L, M, N shells respectively.
Arrange the above postulates of Bohr's theory in a correct sequence:

Q. Velocity of electron and energy of an atom as electrons move from lower orbits to higher orbits.
Q. An electron present in an atom can move from a lower energy level to a level of higher energy by absorbing the appropriate energy.
Q. When energy is supplied to an atom, the electrons of the atom move to higher energy orbits depending on the amount of energy absorbed. When these electrons return to any of the lower energy orbits, they emit energy. Depending on whether the electrons return to the 1st, 2nd, 3rd, 4th or 5th orbits, the series formed are called Lyman, Balmer, Paschen, Brackett and Pfund series respectively.
If the electron comes back from the energy level E2 to the energy level E1, then the difference may be expressed in terms of the energy of photon as
E2−E1=ΔE, λ=hcΔE
Thus each transition from one energy level to another will produce a light of definite wavelength. This is observed as a line in the spectrum of the hydrogen atom.
Wave number of the line is given by the formula
−ν=RZ2(1n21−1n22)
Where R=1.097×105 cm−1 is Rydberg constant.
List - IList - II(I) If the ionisation potential for hydrogen-like atom(P) 5.48×10−32cR Jin a sample is 122.0 eV, then the energy of the lastline of Paschen series for this atom is:(II) In a single isolated atom, an electron makes (Q) 6.6×10−32cR Jtransition from fifth excited state such that no spectral lines are observed in the visible range then maximum number of different types of photons observed is:(III) The difference in energy of the second line(R) 6of Lyman series and last line of Brackett series in ahydrogen sample is:(IV) The energy of the electromagnetic radiation(S) 4emitted during the transition of electron in betweenthe two levels of Li2+ ion whose principal quantumnumber sum is 4 and difference is 2 is:(T) 6.6×10−34cR J(U) 0.53×10−30cR J

Which of the following options has the correct combination considering List-I and List-II?
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