Exercise

What is a wavefront? Describe different types of wavefront

What happens to the resistivity of semiconductors with increase of temperature?

State any two Bohr$\text{'}$s postulates and write the energy value of the ground state of the hydrogen atom.

Draw circuit diagram for a $\mathrm{P}-\mathrm{N}$ junction to obtain reverse bias characteristic curves. Explain the phenomenon of reverse breakdown for a $\mathrm{P}-\mathrm{N}$ junction in reverse bias state by following process-

$\left(\mathrm{ii}\right)$ Zener breakdown

Draw the graph showing the variation of current with voltage for a p-n junction diode in forward bias as well as reverse bias arrangements.

What are optoelectronic devices?

Fringe width is inversely proportional to

LED is a p-n junction diode which is ?