原子物理_智慧树知到答案2021年

第三章 Bohr's Model of the Hydrogen：The Rutherford model cannot explain the stability of atom from the classics physics. Bohr gave three assumptions to describe the hydrogen and explained the spectrum of hydrogen reasonably. The Rydberg equation can be derived by Bohr’s model. Sommerfeld extended the Bohr model to ellipse orbital and relativistic framework to explain the more complicated spectrum of atom. For the heavy atom, there are also the penetration and shielding effects.3.1The classical Atomic Model:The atom was studied with classical mechanics in Rutherford model.
3.2Bohr model:Bohr proposed three assumptions for atom to overcome the problems in Rutherford model.
3.3The spectrum of hydrogen:The structure of atom can be extracted from the spectrum of hydrogen.
3.4The correspondence principle:The theory in microscopic world can be connected with classic physics in some limits.
3.5The Rydberg equation:The Bohr model can explain the empirical spectrum formula, Rydberg equation.
3.6Atomic Excitation by Electrons:The electrons in atom can be excited to high energy levels.
3.7The extension of Bohr model:Sommerfield extended the Bohr model to ellipse orbit and relativistic framework.
3.8Penetration and shielding effects:In the many-electrons atom, the Bohr model should be modified.
3.9Exercise:There are several exercises about the Bohr model.

[单选题]A beam of electrons bombards a sample of hydrogen. Through what potential difference must the electrons have been accelerated if the first line of the Balmer series is to be emitted? (   ) 

选项:[0.6 V, 569.3 V, 12.1 V , 35.7 V ]
[单选题]When an electron jumps from its orbit to another orbit, energy is (   ).  

选项:[emitted , no effect , absorbed , both]
[单选题]A proton and an electron, both at rest initially, combine to form a hydrogen atom in the ground state. A single photon is emit- ted in this process. What is its wavelength? (    )

选项:[357 nm, 49 fm, 15 mm, 91.2 nm]
[单选题]If the electron in hydrogen atom jumps from the third orbit to second orbit, the wavelength of th emitted radiation is given by (    ) 

选项:[5/R , R/6, 5R/36, 36/5R]
[单选题]The longest wavelength in the Lyman series is 121.5 nm and the shortest wavelength in the Balmer series is 364.6 nm. Find the longest wavelength of light that could ionize hydrogen. (    ) 

选项:[91.13 nm, 49.4 fm, 74.5 mm, 8.3 nm]
[单选题]In hydrogen atom the angular momentum of the electron in the lowest energy state   (   )  

选项:[h/2p, h/p, 2h, 2p/h]
[单选题] What determines the difference in energy between two energy levels? (   ) 

选项:[number of valence electrons, distance from the nucleus, distance between the two energy levels, number of electrons in the energy levels ]
[单选题]The ratio of the speed of the electron in the ground state of hydrogen atom to the speed of light is  (    ) 

选项:[1/137 , 1/237 , 1/2, 2/137]
[单选题]What is the shortest wavelength present in the Brackett series of spectral lines? (  )  

选项:[569.34 nm, 91.13 nm, 1.46 mm, 327.89 nm]
[单选题]According to Bohr model of hydrogen atom, the radius of stationary obit characterized by the principal quantum number n is proportional (    )   

选项:[1/n,  n , 1/n² , n² ]