An ideal diode should pass a current freely in one direction and should stop it completely in the opposite direction. Which is closer to ideal-vacuum diode or a p-n junction diode?

In a p - n junction diode

Discuss some of the applications of p-n junction diode .

In the depletion region of an unbiased p-n junction diode, there are

A long solenoid of radius 2 cm has 100 turns/cm and is surrounded by a 100- turn coil of radius 4cm having a total resistance of 20 Omega . The coil is connected to a galvanometer as shown in fig. If the current in the solenoid is changed form 5 A in one direction to 5 A in the opposite direction, find the charge which flows through the galvanometer.

Light of wavelength 390 nm is directed at a metal electrode. To find the energy of electrons ejected, an opposing potential difference is established between it and another electrode. The current of photoelectrons from one to the other is stopped completely when the potential difference is 1.10 V. Determine (i) the work function of the metal and (ii) the maximum wavelength of light that can electrons from this metal.