Q: Consider a collection of a large number of particles each with speed v. The direction of velocity is randomly distributed in the collection. What is the magnitude of the relative velocity between a pairs in the collection
(a) 2V/π
(b) V/ π
(c) 8V/ π
(d) 4V/ π
Q: The absolute zero is the temperature at which
(a) Water freezes
(b) All substance exist in solid state
(c) Molecular motion ceases
(d) None of the above
Q: The temperature at which the r.m.s. speed of hydrogen molecules is equal to escape velocity on earth surface, will be
(a) 1060 K
(b) 5030 K
(c) 8270 K
(d) 10063 K
Q: The root mean square speed of the molecules of a diatomic gas is v. When the temperature is doubled, the molecules dissociate into two atoms. The new root mean square speed of the atom is
(a) √2 v
(b) v
(c) 2 v
(d) 4 v
Q: N molecules each of mass m of gas A and 2 N molecules each of mass 2 m of gas B are contained in the same vessel at temperature T. The mean square of the velocity of molecules of gas B is v2 and the mean square of x component of the velocity of molecules of gas A is w2 . The ratio w2/v2 is
(a) 1
(b) 2
(c) 1/3
(d) 2/3