Molecular Physics | Thermodynamics Answers

Tw o mole s o f a monatomi c idea l ga s ar e a t a temperatur e o f 

300 K. Th e ga s expand s reversibl y an d isothermall y t o twic e it s 

original volume . Calculat e th e wor k don e b y th e gas , th e hea t 

supplied an d th e chang e in the interna l energy . 

Heat and work are 
A-state variable
B-state function
C-intensive properties 
D-system properties

Properties of substances like pressure, temperature and density, in thermodynamics are

 A. path functions 

B. state functions 

C. real functions 

D. state variable 

Derive Clausius-Clapeyron equation. Explain why the boiling point of water increases with increasing pressure. 

The mean speed of the molecules of an ideal gas is 2.0*10^3 ms^-1 . The radius of a gas molecule is 1.5*10^-10m. Calculate the (i) collision frequency, and (ii) mean free path. It is given that n=4*10^24m^-3 .

The expression for the number of molecules in a Maxwellian gas having speeds in

the range v to v + dv is

dN_V=4(3.14)N((M/(2(3.14)k_BT))^3/2 V² exp[-(mv²/2k_BT)]dV)

Using this relation, obtain an expression for average speed. Also, plot Maxwellian

distribution function versus speed at three different temperatures.

An iron has a power of 1000 W. How much energy will it electrically transfer each second?

1. What is velocity

1) The most sensitive thermometer is.....

2) Modern thermometer is based on the expansion and contraction of.....

A centrifugal pump is used to deliver 60 kg of water per second. The inlet and outlet pressures are 1 bar and 4.3 bar respectively. The suction is 2.3 m below the centre of the pump and delivery is 8.5 m above the centre of the pump. The suction and delivery pipe diameters are 200 mm and 100 mm respectively. Determine the capacity of the electric motor to run the pump in kW and per kg of water.