The ratio of the nuclear densities of two nuclei having mass numbers 64 and 125 is

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?