The kinetic energy of an electron is increased by 2 times, then the de-Broglie wavelength associated with it changes by a factor.

The change in the internal energy of the mass of gas, when the volume changes from ' $V$ ' to ' 2 V ' at constant pressure ' $P$ ' is ( $\gamma$ is the ratio of specific heat of gas at constant pressure to specific heat at constant volume)

In the circuit diagram shown in figure, the current through the zener diode is

If the electric flux entering and leaving an enclosed surface are $\phi_1$ and $\phi_2$ respectively, the electric charge inside the surface will be