CSIR (Council of Scientific & Industrial Research) Physical Sciences: Questions 351 - 355 of 696
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Question 351
Appeared in Year: 2011
Question MCQ▾
A gas of N non- interacting particles is in thermal equilibrium at temperature T. Each particle can be in any of the possible non – degenerate state of energy . The average energy per particle of the gas, when , is – (December)
Choices
Choice (4) | Response | |
---|---|---|
a. | ε | |
b. | ||
c. | ||
d. |
Question 352
Appeared in Year: 2012
Question MCQ▾
The energy required to create a lattice vacancy in a crystal is equal to . The ratio of the number densities of vacancies , when crystal is equilibrium at 1200 K and 300 K, respectively, is approximately, (June)
Choices
Choice (4) | Response | |
---|---|---|
a. | ||
b. | ||
c. | ||
d. |
Question 353
Appeared in Year: 2011
Question MCQ▾
Two gravitating bodies A and B with masses and , respectively, are moving I circular orbit. Assume that and let the radius of the orbit of body A be . If the body A is losing mass adiabatically, its orbital radius is proportional to –
(June)
Choices
Choice (4) | Response | |
---|---|---|
a. | ||
b. | ||
c. | ||
d. |
Question 354
Appeared in Year: 2011
Question MCQ▾
Let and be two linearly independent solutions of the differential equation, and let . If , then is given by, (December)
Choices
Choice (4) | Response | |
---|---|---|
a. | ||
b. | ||
c. | ||
d. | 1 |
Question 355
Appeared in Year: 2011
Question MCQ▾
The energy levels of electrons of mass ‘m’ and charge ‘e’ confined in an area A in the xy – plane with a uniform magnetic field B applied in the z – direction are given by the degeneracy of each level is . The lowest level is completely filled and the others are empty. The Fermi energy , where, N is the total number of electrons, is – (December)
Choices
Choice (4) | Response | |
---|---|---|
a. | Midway between the and the levels | |
b. | Midway between the and the levels | |
c. | Coincident with the level | |
d. | Coincident with the level |