The kinetic energy within the molecules of gas increases with a

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Fall in temperature

Rise in temperature

Decrease in pressure

Increase in pressure

answer is B.

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Detailed Solution

The kinetic energy within the molecules of gas increases with a rise in temperature.
Relation between and temperature:
"The temperature of a substance is directly related to its kinetic energy." Because kinetic energy is the energy, a substance possesses because its molecules are in movement (motion). Therefore, as a substance absorbs heat, its molecules move faster, thereby increasing the substance's kinetic energy.
A measure of the gas particles' motion is a gas's kinetic energy. The movement (motion) of the particles increases with a rise in the temperature, which raises the gas's kinetic energy. Therefore, the average kinetic energy of a group of gas particles depends only on the temperature of the gas.

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