An ideal gas is enclosed in a piston, and exactly of work is done on the gas. as this happens, the internal energy of the gas increases by exactly during this process, how much heat flows into or out of the ideal gas? enter a positive number to indicate a heat flow into the gas or a negative number to indicate a heat flow out of the gas.

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?