An \"Isentropic\" change in a system is one where the entropy doesn\'t change (a

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An "Isentropic" change in a system is one where the entropy doesn't change (approximately). In gases, this can happen if changes are made faster than energy can flow in or out of the gas due to the temperature difference with the surroundings. For example, sound waves and the winds blowing down the sides of mountains are often modeled as being constant entropy. Consider air traveling down the California coastal mountains, starting at a height of 3000 m and an atmospheric pressure of 74 kPa and temperature of 4 degrees Celsius down to sea level. What is the temperature of the air when it reaches Los Angeles at sea level (air pressure of 101 kPa)? Hint: The entropy of a diatomic ideal gas (air) is S(T,V,N)=N?ln(V?T5/2) Give your answer in oC to three digits.

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pls go through this link it may helps you
1)exvacuo.free.fr/div/Sciences/Cours/Thermo/.../Thermodynamics.PDF

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