Question

When a gas is compressed adiabatically by moving a piston down, the temperature of the gas increases. At the microscopic level, the average kinetic energy of the molecule increases. This increase in kinetic energy occurs due to

• A. collision of gas molecules with entire walls.
• B. collision of gas molecules with moving piston.
• C. the decrease in contact area.
• D. because of elastic nature of collisions.

Answer 1

Answer: (B)

collision of gas molecules with moving piston.

When the particle collides with moving piston, they strike with less speed and bounce with greater speed. Hence, kinetic energy increases.