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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 - Physics

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प्रश्न

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?

टीपा लिहा

उत्तर

Much less

The probability of scattering of α-particles at angles greater than 90° predicted by Thomson’s model is much less than that predicted by Rutherford’s model.

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  या प्रश्नात किंवा उत्तरात काही त्रुटी आहे का?
पाठ 12: Atoms - Exercise [पृष्ठ ४३६]

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एनसीईआरटी Physics [English] Class 12
पाठ 12 Atoms
Exercise | Q 12.11 (b) | पृष्ठ ४३६
एनसीईआरटी Physics [English] Class 12
पाठ 12 Atoms
Exercise | Q 11.2 | पृष्ठ ४३६

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?


The size of the atom in Thomson’s model is ____________ the atomic size in Rutherford’s model.


In the ground state of ____________ electrons are in stable equilibrium, while in ____________ electrons always experience a net force. (Thomson’s model/Rutherford’s model)


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

Is the average angle of deflection of α­-particles by a thin gold foil 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.

Keeping other factors fixed, it is found experimentally that for small thickness t, the number of α-particles scattered at moderate angles is proportional to t. What clue does this linear dependence on t provide?


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?


In a Geiger-Marsden experiment, calculate the distance of closest approach to the nucleus of Z = 75, when a α-particle of 5 MeV energy impinges on it before it comes momentarily to rest and reverses its direction.

How will the distance of closest approach be affected when the kinetic energy of the α-particle is doubles?


Alpha particles used in Geiger-Marsden experiment were obtained from ______.


The model that best explains the results of Geiger-Marsden experiment is ______.


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.


The radius of electron's second stationary orbit in Bohr's atom is R. The radius of 3rd orbit will be:-


The ratio of the frequencies of the long wave length its of Lyman Balmer series of hydrogen spectrum is


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Would the Bohr formula for the H-atom remain unchanged if proton had a charge (+4/3)e and electron a charge (−3/4)e, where e = 1.6 × 10–19C. Give reasons for your answer.


The Bohr model for the H-atom relies on the Coulomb’s law of electrostatics. Coulomb’s law has not directly been verified for very short distances of the order of angstroms. Supposing Coulomb’s law between two opposite charge + q1, –q2 is modified to |F| = `(q_1q_2)/((4πε_0)) 1/r^2, r ≥ R_0 = (q_1q_2)/(4πε_0) 1/R_0^2 (R_0/r)^ε, r ≤ R_0` Calculate in such a case, the ground state energy of a H-atom, if ε = 0.1, R0 = 1Å.


A narrow beam of protons, each having 4.1 MeV energy is approaching a sheet of lead (Z = 82). Calculate:

  1. the speed of a proton in the beam, and
  2. the distance of its closest approach

The energy levels of a certain atom for first, second and third levels are E, 4E/3 and 2E, respectively. A photon of wavelength λ is emitted for a transition 3 `→` 1. What will be the wavelength of emission for transition 2 `→` 1?


The shortest wavelength of the Brackett series of a hydrogen like atom of atomic number Z is same as the shortest wavelength of the Balmer series of hydrogen atom, then the value of Z is ______.


Radius of the 1st orbit of hydrogen atom is r0. What will be the radius of the 4th orbit?


During Rutherford’s gold foil experiment, it was observed that most of the α-particles did not deflect. However, some showed a deflection of 180°. 

What hypothesis was made to justify the deflection of α-particle by 180°?


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