मराठी

The first line of Balmer series (Hα) in the spectrum of hydrogen is obtained when an electron of hydrogen atom goes from ______.

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प्रश्न

The first line of Balmer series (Hα) in the spectrum of hydrogen is obtained when an electron of hydrogen atom goes from ______.

पर्याय

  • 2nd orbit to 1st orbit

  • 2nd orbit to 3rd orbit

  • 3rd orbit to 2nd orbit

  • 3rd orbit to 1st orbit

MCQ
रिकाम्या जागा भरा
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उत्तर

The first line of Balmer series (Hα) in the spectrum of hydrogen is obtained when an electron of hydrogen atom goes from 3rd orbit to 2nd orbit.

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2021-2022 (March) Set 1

संबंधित प्रश्‍न

Using Rutherford's model of the atom, derive the expression for the total energy of the electron in hydrogen atom. What is the significance of total negative energy possessed by the electron?


An atom has a nearly continuous mass distribution in a ______ but has a highly non-uniform mass distribution in ______.


Answer the following question, which help you understand the difference between Thomson’s model and Rutherford’s model better.

Is the probability of backward scattering (i.e., scattering of α-particles at angles greater than 90°) predicted by Thomson’s model much less, about the same, or much greater than that predicted by Rutherford’s model?


Answer the following question, which help you understand the difference between Thomson’s model and Rutherford’s model better.

In which model is it completely wrong to ignore multiple scattering for the calculation of average angle of scattering of α-particles by a thin foil?


Define the distance of closest approach. An α-particle of kinetic energy 'K' is bombarded on a thin gold foil. The distance of the closest approach is 'r'. What will be the distance of closest approach for an α-particle of double the kinetic energy?


For 7.7 Mev alpha particles scattering from aluminium (Z = 13), the distance of closest approach in a bead on collision is ______.

Useful data

`1/(4 pi ∈_0) = 8.99 xx 10^9` newton m2C-2; c = 1.60 × 10-19 C; leV = 1.60 × 10-19j.


Assume that there is no repulsive force between the electrons in an atom but the force between positive and negative charges is given by Coulomb’s law as usual. Under such circumstances, calculate the ground state energy of a He-atom.


If λa, λb and λc represent the Kα, Kβ and Lα transition wavelengths in a hydrogen atom, respectively. Then which of the following is correct?


Why is the nucleus treated as stationary during scattering?


Why is an alpha-particle assumed to suffer only a single scattering?


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