During the formation of a $$p$$-$$n$$ junction:

The diagram shows four energy level of an electron in Bohr model of hydrogen atom. Identify the transition in which the emitted photon will have the highest energy.

Which of the following graphs correctly represents the variation of a particle momentum with its associated de-Broglie wavelength?

The capacitors, each of $$4 \mu \mathrm{F}$$ are to be connected in such a way that the effective capacitance of the combination is $$6 \mu \mathrm{F}$$. This can be achieved by connecting