which of the following happens

The temperature of the room doubles

the number of collisions per unit area doubles

the number of collisions per unit area is reduced by one half

half of the gas leaks out and the pressure is reduced

Thank you for the opportunity to help you with your question!

In this question you have doubled the volume.

Increasing the volume leads to a decrease in pressure, when there is no temperature change indicated.

You also should assume that the system is airtight, so the final answer is not accurate.

So a decrease in pressure corresponds to a decreasing number of particle collisions.

The solution would be that the number of collisions is reduced by 1/2

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