Answer:
option A: Allow some of the helium to leak out in the air
option B: place the tank outside on a cold winter day
Explanation:
To choose the correct answer we will check each option one by one
option A:
Allow some of the helium to leak out in the air
The pressure will be decrease inside the tank when volume of gas in the container decrease. as we leak the helium gas from tank the number of molecules in the tank decreases that exert pressure on the wall of the container.
option B:
place the tank outside on a cold winter day
when we keep the tank in cold winter the kinetic energy of the molecules of the gas reduces also upon cooling the inter-molecular forces start operating and it decrease the collision of molecules with wall of the container and pressure inside tank decreases.
option C:
Place the tank in the trunk of a car on a hot summer day
when we keep the tank in the trunk of a car on a hot summer day the kinetic energy of the molecules of the gas increases and also upon increased temperature inter-molecular forces decrease and molecule move apart so the collision of molecules with wall of the container increases and pressure inside tank also increases.
option D:
Add more helium atoms to the tank
if we increases the volume of the gas in the container by adding more atoms in the tank it increases the pressure inside the tank and exert more pressure on the wall of the container so pressure inside the tank increase
So,
only option A and B is correct.
