Molecular Physics | Thermodynamics Answers

one mole of an ideal gas expands isothermally to five times its initial volume.calculate the entropy change in terms of R,the gas constant

The standard fixed point for temperature measurements in use today is
A) melting point of ice at one atmospheric pressure
B) of pure ice and pure water in equilibrium at one atmosphere pressure
C) at which ice, water and watervapour coexist
D) none of the above

a sonometer wire having cross section area 0.85×10^-6 is stretched between two rigid supports 1.2 m apart. A tension of 20 N is applied at its free end. If the temperature is reduced by 12℃, calculate the final tension in the wire. Take coefficient of linear expansion and isothermal Young's modulus to be 1.5×10^-5K^-1 and 2.0×x10^11 Nm^-2, respectively.

The time period of a simple pendulum ,called 'second pendulum ' is 2 s .Calculate the length ,angular frequency And frequency of the pendulum.

Glass of relative permitivity 4 is kept in an external electric field of magnitude 102 Vm−1. Calculate the polarisation vector, molecular/atomic polarisability and the refractive index of the glass.

Using the first law of the thermodynamics for an adiabatic processes, establish the relation PV power of gama =K Where gama is the ratio pf the heat capacity of constant pressure to that at constant volume .plot this equation on a P-v diagram .What will be its slope?

Derive an expression for the work done by a gaseous system for an isothermal expansion of an ideal gas.

Explain the working of a platinum resistance thermometer with the help of a neat am labelled diagram.

A stretched string of mass 20 g vibrates with a frequency of 30 Hz in its fundamental mode and the supports are 40 my apart. The amplitude of vibrating at the antinode is 4 cm .Calculate the velocity of propagation of the wave in the string as well as the tension in it.

The linear density of a vibrating string 1.3×1/10000 kg/m .A transverse wave is propagation on the string &is describe by the equation y (x,t)= 0.021sin (30t-x) where x&y is in meter &t is in second calculate the tension in the string.