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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.
Q. A capacitor blocks d.c. but allows a.c. Why? Capacitive reactance XC = 1/ω C = 1 / 2πν C Where ν is the frequency of the a.c. supply. In a d.c. circuit
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The atomic weight of an element is double its atomic number. If there are four electrons in 2P orbital, the element is : (1) C (2) N (3) O
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