Final answer:
Decreasing the volume of a gas sample while holding the temperature constant results in an increase in the number of molecule-wall collisions per unit area per unit time.
Step-by-step explanation:
When the volume of a gas sample is decreased at constant temperature, the number of molecule-wall collisions per unit area per unit time will increase. This is because the gas molecules have less space to move in and will collide with the walls more frequently. According to Avogadro's law, at constant pressure and temperature, the frequency of molecule-wall collisions remains constant. However, since we are reducing volume while keeping the amount of gas and temperature constant, the gas particles are confined to a smaller space, increasing the collision frequency with the container walls.