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Q. Write any three applications of laser in industry.
Industrial applications
(i) The laser beam is utilized to drill extremely fine holes in diamonds hard sheets etc.
(ii) They are as well used for cutting thick sheets of hard metals and welding.
(iii) The laser beam is utilized to vaporize the unwanted material during the manufacture of electronic circuit on semiconductor chips.
(iv) They can be utilized to test the quality of the materials.
Define coherence and explain temporal and spatial coherence. Show that visibility is a maxim of coherence. Define the 'Q' factor for a spectral line. Explain coherence length and c
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Q. In the given circuit, calculate the current through the circuit and mention its direction . Let the current be I. 5I + 10 I + 5 I = 10 + 20 that is 20 I = 30 Current I =
mass of body= 4 kg is dropped form height= 45 m Calculate the kinetic energy just before hitting the ground
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