Atoms and NucleiBohr Model [NEET (NTA)National Eligibility cum Entrance Test (Medical) Physics]: Questions 1  3 of 15
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Question number: 1
» Atoms and Nuclei » Bohr Model
Question
In the Bohr model of a hydrogen atom, the centripetal force is furnished by the coulomb attraction between the proton and the electron. If a _{0} is the radius of the ground state orbit, m is the mass, e is the charge on the electron and s _{0} is the vacuum permittivity, the speed of the electron is
Choices
Choice (4)  Response  

a. 
 
b. 
 
c. 
 
d. 

Question number: 2
» Atoms and Nuclei » Bohr Model
Question
The electron in a hydrogen atom makes a transition , where n _{1} and n _{2} are the principal quantum numbers of two states. Assume the Bohr model to be valid. The time period of the electron in the initial state is eight times that in the final state. Then,
(1) n _{1} = 4 (2) n _{2} = 2
(3) n _{2} = 5 (4) n _{1} = 5
Select the correct answers and mark it according to the following codes:
Choices
Choice (4)  Response  

a.  1 and 2 are correct  
b.  1,2 and 3 are correct  
c.  1 and 3 are correct  
d.  2 and 4 are correct 
Question number: 3
» Atoms and Nuclei » Bohr Model
Question
If m is mass of electron, v its velocity, r the radius of stationary circular orbit around a nucleus with charge Ze, then from Bohr’s first postulate, the kinetic energy of the electron in C. G. S system is equal to.
Choices
Choice (4)  Response  

a. 
 
b. 
 
c. 
 
d. 
