In a certain sample of gas at 25° C the number of molecules having speeds between $4 \mathrm{km} {\sec }^{-1}$ and $4.1 \mathrm{km} {\sec }^{-1}$ is N. If the total number of gas molecules at the same temperature are doubled what will happen?

Value of most probable velocity will change.

Area under the Maxwell's curve for distribution of speeds will increase by four times.

No. of molecules between $4 \mathrm{km} {\sec }^{-1}$ and $4.1 \mathrm{km} {\sec }^{-1}$ will become 2N.

No. of molecules between $4 \mathrm{km} {\sec }^{-1}$ and $4.1 \mathrm{km} {\sec }^{-1}$ will remain same.