Give the difference between two specific heat' of 1 gm He at standard temperature and pressure. Molecular weight of He = `4 xx 1836 xx 9 .11 xx 10^-31`kg & J = `4.186 xx 10^7 erg. cal^-1`.

What will be the specific heats of helium at constant volume and constant pressure? gamma of helium = 1.667, R = 8.318 xx 10^(7) erg cdot mol^(-1) cdot^(@)C^(-1) , J = 4.18 xx 10^(7) erg cdot cal^(-1) and molecular mass of helium = 4.

Calculate the molecular kinetic energy of 1 g helium gas at 127^@C Molecular weight of helium=4 and R=8.3 times 10^7 erg. Mol^-1.K^-1 .

A piece of lead is dropped to the ground from a height of 200 m. What will be the increase in its temperature? Specific heat of lead = 0.03 cal cdot g^(-1) cdot^(@)C^(-1), J = 4.2 xx 10^(7) erg cdot cal^(-1)

Calculate the mean free path for the collision of nitrogen molecules at 0^@C temperature at 1 standard atmosphere pressure. The mean time interval between two successive collisions = 1.9 times 10^-10 s, R=8.31 times 10^7 erg.mol^-1.K^-1 molecular mass of nitrogen =28.

Two lead bullets of equal mass top after head-on Collison and reach their melting point due to the heat generated. The temperature of the bullets before collision was 35^(@)C . Find the relative velocity of the bullets before collision. Specific heat of lead = 0.03 cal cdot g^(-1) cdot^(@)C^(-1) , melting point of lead = 335^(@)C, J = 4.18 xx 10^(7) erg cdot cal^(-1) .

Sea water is splattered horizontally from a jet at a speed of 10 m cdot s^(-1) . The water comes to rest after falling in a container, 20 m below the jet level. What will be the increase in the temperature of the water? Specific heat of sea water = 0.94 cal cdot g^(-1) cdot^(@)C^(-1), J = 4.2 xx 10^(7) erg cdot cal^(-1) .

Calculate the kinetic energy of a moving electron which has a wavelength of 4.8 pm. [mass of electron = 9.11 xx 10^(-31) kg, h = 6.626 xx 10^(-34) Kg m^2s^(-1) ].

At 27^@C the average thermal energy of He atom is [K = 1.38 xx 10^-23 J]