The lower energy level contains more atoms than upper level under the conditions of                                  

Related MCQs

• A device which converts electrical energy in the form of a current into optical energy is called as                        
• The energy-level occupation for a semiconductor in thermal equilibrium is described by the                      
• Which of the following are not considered as environmental conditions required for field measurements?
• The rounding of the fiber ends with a low energy discharge before pressing the fibers together and fusing with a stronger arc is called as                          
• In surface emitter LEDs, more advantage can be obtained by using                          
• Fall times of 1 ns or more are common.
• It is a device that distributes light from a main fiber into one or more branch fibers.
•                          refers to the process whereby a node finds one or more paths to possible destinations in a network.
• Propagation losses in slab and strip waveguides are smaller than the single mode fibre losses.
• Plastic fibers are less widely used than glass fibers.