Assertion : Light emitting diode (LED) emits spontaneous radiation. Reason : LED are forward biased p-n junctions.
Mention the important considerations required while fabricating a p-n junction diode to be used as light emitting diode (LED). What should be the order of the band gap of an LED if it is required to emit light in the visible region.
When as tronomical telescope is adjusted for normal adjustment the finla image is formed at
An LED is constructed from a p-n junction based on a certain semi-conducting material whose energy gap is 1.9 eV. Then, the wavelength of the emitted light is
