Calculate the specific enthalpy of helium at 300 k and 1 atm and the rate at which enthalpy is transported by a stream of helium at the same conditions with a molar flowrate of 300 kmol/h. the specific internal energy of helium at 300 k and 1 atm is 3800 j/mol and specific molar volume is 24.63 l/mol.

Amichelson interferometer operating at a 600 nm wavelength has a 3.02-cm-long glass cell in one arm. to begin, the air is pumped out of the cell and mirror m2 is adjusted to produce a bright spot at the center of the interference pattern. then a valve is opened and air is slowly admitted into the cell. the index of refraction of air at 1.00 atm pressure is 1.00028.how many bright-dark-bright fringe shifts are observed as the cell fills with air?