CSIR (Council of Scientific & Industrial Research) Physical Sciences: Questions 219  221 of 463
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Question number: 219
» Quantum Mechanics » SpinStatistics Connection
Appeared in Year: 2013
Question
Consider three particles A, B and C each with an attribute S that can take two values Let and at a given instant. In the next instant, each S value can change to with probability . The probability that remains unchanged is – (June – 2013)
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 220
» Classical Mechanics » Conservation Laws and Cyclic Coordinates
Appeared in Year: 2012
Question
A planet of mass m moves in the gravitational field of the Sun (mass M). If the semi – major and semi – minor axes of the orbit are and respectively, the angular momentum of the planet is – (December)
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 221
» Atomic & Molecular Physics » Relativistic Corrections for Energy Levels of Hydrogen Atom
Appeared in Year: 2013
Question
The energy of an electron in a band as a function of its wave vector is given by , where and are constants. The effective mass of the electron near the bottom of the band is – (Dec 2013)
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 

