The most probable electron velocity with increasing temperature To 1) __ increases in proportion to T. 2) ...increases proportionally 71/2 4)...increases proportionally to T- 8) ...does not change. Specify the correct approval number.

The correct answer is 2)...increases proportionally $71/2$.<br /><br />Explanation:<br />The most probable electron velocity in a gas increases proportionally to the square root of the temperature (T). This relationship is derived from the Maxwell-Boltzmann distribution, which describes the distribution of speeds of particles in a gas. The most probable speed is proportional to the square root of the temperature, which means it increases proportionally to the square root of T, or $T^{1/2}$.