Molecular Physics | Thermodynamics Answers

A resistor initially at 300k has a het capacity of 10Jk^-1 it is thermally insulted from its surrounding and is connected to a battery from which it takes 1200J through an electric current calculate the change in entropy of the resistor and the surrounding.

The of a platinum resistance Thermometer at o degree is 8.4 ohm,at 100 degree is 10 ohm and 16.5 at the temperature of liquid inside a bath.find the temperature of liquid.the thermometer is then placed in a flask containing liquid hydrogen at -150 degree.what will be the value of its resistance?.

Calculate the partition function, free energy, entropy, CV and Cp of N linear 

harmonic oscillators

Derive Planck’s law of black body radiation.

What is meant by internal energy of a system? State the first law of 

thermodynamics in its differential form. Write it for isothermal, adiabatic and 

isochoric changes.

State how increasing the temperature of a gas changes its volume, assuming pressure is held constant. (Try to state your answer in your own words.....I will award more points according whether you copy and paste an answer, or put it into your own words

a cylindrical metal has a height of 0.27 m and a radius of 0.11 m the electrical field is directed upward along the entire surface of the cake and including the top and bottom which with uniform magnitude of 4.0 x 10-5 N/C how many charge does the can contain

Sho w that the following relations hold for a reversible adiabatic 

expansion o f an idea l gas: 

The firebal l o f a uraniu m fissio n bom b consist s o f a spher e o f ga s 

of radiu s 15 m and temperatur e 300000 K shortl y after detonation . 

Assuming that the expansion is adiabatic and that the fireball remain s 

spherical, estimat e th e radiu s o f the bal l whe n th e temperatur e i s 

3000 K. (Tak e y=1.4.) 

A thick-walle d insulatin g chambe r contain s n x

 mole s o f 

helium ga s a t a hig h pressur e Px

 an d temperatur e T x

. I t is allowed 

to lea k ou t slowl y t o th e atmospher e a t a pressur e P 0

 throug h a 

small valve. Show that the final temperature o f the n2

 mole s of helium 

left i n the chambe r i s 

(Hint: Conside r a s you r syste m th e ga s tha t i s ultimatel y lef t i n 

the chamber. ) 

Fin d th e chang e i n th e interna l energ y o f on e mol e o f a 

monatomic ideal gas in an isobaric expansion at 1 atm from a volume 

of 5m 3

 t o a volume of 10m3

. y for a monatomi c idea l gas is 5/3 .