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It is the need of elastic strength of a substance when subjected to repeated stresses and strain. If the substance is reserved undisturbed for some time, the previous properties are restored. Therefore elastic fatigue is a temporary phenomenon.
Q. What are the conditions to achieve the laser action? Conditions to achieve laser action (i) There should be an inverted population that is more atoms in the excited
Advantages of fibre optics: Fibre-optic communications systems have a large bandwidth, e.g. 1 GHz. The bandwidth is the maximum rate at which information can be transmitted.
What are the advantages of polymer fibers optics? The spectral transmission of PMMA fibers is not easy to enhance upon, the quality of the light transmitted over distances long
Constant Acceleration 1-dimensional kinematics of a body undergoing constant acceleration. Involves visually integrating the acceleration and velocity graphs or visually differ
Infra-Red (IR) Detectors: An IR detector has an impedance of Z= (400+j200) ? . During design tests the detector current is measured as 4 µA. What is the output v
1 Ampere: 1 ampere current is supposed to be flowing in a conductor if one coulomb of charge flows across section of the wire in one second.
Describe the internals of a light-emitting diode (LEO). Describe what happens internally when sufficient current is applied to activate LED. What isthe device pictured? Wh
A windmill is operating in a 10 m/s wind that has a density of 1.2 kg/m 3 . The diameter of the windmill is 4 m. The constant-pressure (atmospheric) stream tube has a diameter of 3
how Michelson interferometer can be used to measure the wavelength of sodium light.
Newton''s rings are formed between a spherical lens surface and an optical flat. If the tenth bright ring of green light (545.1 nm) is 7.89 mm in diameter, what is the radius of cu
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