Question 774: Thermodynamics & KTG

Question

The internal energy of a gas will increase when it

Accepted Answer

The internal energy of a gas will increase when it is subjected to an adiabatic process in which work is done on the gas. This is because, in an adiabatic process, no heat is exchanged with the surroundings, so any work done on the gas results in a change in its internal energy.
Explanation
Adiabatic Process:
A process in which no heat is transferred to or from the system. The change in internal energy is solely due to the work done on or by the system.
Compression vs. Expansion:
In
adiabatic compression
, work is done on the gas, which increases its internal energy. This results in a rise in temperature.
In
adiabatic expansion
, the gas does work on the surroundings, causing a decrease in its internal energy, thus leading to a drop in temperature.
Isothermal Process:
A process that occurs at constant temperature. For an ideal gas, the internal energy depends only on temperature, hence there is no change in internal energy.
In
isothermal compression
or
isothermal expansion
, although work is done, the heat exchanged is such that the internal energy remains constant.
Therefore, the correct option is:
Option B:
The internal energy of a gas will increase when it is compressed adiabatically.

Answer

expands adiabatically.

Answer

is compressed adiabatically.

Answer

expands isothermally.

Answer

is compressed isothermally.

Thermodynamics & KTG

The internal energy of a gas will increase when it

Choose the correct answer: