LED and Laser diode - class-XII
Description: LED and Laser diode | |
Number of Questions: 14 | |
Created by: Girish Devgan | |
Tags: semiconductor electronics: materials, devices and simple circuits electronic devices electrical appliances in everyday life physics semiconductors resistance and resistivity |
Students in a lab are trying to determine the wavelength of laser light by shining the laser through two narrow slits separated by $9.60$ micrometers toward a screen $4.00$ meters away. The first order bright fringes are $23.0$ centimeters from the center fringe.
What wavelength do the students determine?
The colour of light emitted by a LED depends on
The colour of light emitted by an LED depends on
Bye surgery is one of the medical procedures in which laser technology has become an important aid. Who, among the following was the first to produce laser in $1960$?
In He-Ne laser, metastable state exists in:
A laser operates at a frequency of $3\times 10^{14} H _z$ and has an aperture of $1cm$. The radii spread of the beam is
The principal of LASER action involves
Wavelength of a laser beam can be used as a standard of:
LED glows even when a ______ electric current passes through it. Fill in the blank.
A solid reflects incident light and its electrical conductivity decreases with temperature. The bonding in this solid is :
LEDs are better than conventional incandescent power lamps because:
A laser device produces amplification in the
LASER is an acronym for light amplification by.