(a) Tabulate the differences in the characteristics of states of matter.
(b) Comment upon the following: rigidity. Compressibility. Fluidity. Filling a gas container, shape, kinetic energy and density.

Tabulate the differences in the states of matter on the basis of the following characteristics : (i) Rigidity (ii) Kinetic energy (iii) Density.

State if each of the following statements is true or false. Give reasons for your answer. a) In an elastic collision of two bodies, the momentum and energy of each body is conserved. b)Total energy of a systm is always conserved,no matter what internal and external forces on the body are present. Work done in the motion of a body over a closed loop is zero for every force in nature. d) In an inelastic collision, the final kinetic energy is always less than the initial kinetic energy of the sytem.

In a photoelectric experiment, a monochromatic light is incident on the metal plate A. It was observed that with V = 5 "volt" , the maximum kinetic energy of photoelectrons striking plate B was 1 eV . The polarity of the applied potential difference was as shown in figure (a). With polarity of the applied potential difference reversed (as shown in figure (b)) and frequency of incident light doubled, it was observed that in saturation state, the kinetic energy of electrons striking plate B ranged between 5 eV to 20 eV. Find the work function of metal used in plate A.

A fixed container is fitted with a piston which is attached to a spring of spring constant k . The other and of the spring is attached to a rigid wall. Initially the spring is in its natural length and the length of container between the piston and its side wall is L . Now an dideal diatomic gas is slowly filled in the container so that the piston moves quasistatically. It pushed the piston by x so that the spring now is compressed by x . The total rotaional kinetic energy of the gas molecules in terms of the displacement x of the piston is (there is vacuum outside the container)