When a sample of an ideal gas is allowed to expand at constant temprature against an atmospheric pressure. (a) surrounding does work on the system (b) ΔU = 0 (c) no heat exchange takes places between the system and surroundings. (d) internal energy of the system increases.
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Answer:
b
Explanation:
adiabatic expansion takes place.
that is what happens in the environment too when exhaust gases from vehicles rises up in the sky. the ball of gas expands and it goes up the pressure outside the gas parcel decreases. hence the temperature of inside the parcel also decreases. but there is no heat addition or subtraction from the system.
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