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Lasers are widely used in various walks of life. These are
sources of
(1) Sound waves of very high frequency
(2) Sound waves of very high intensity
(3) Light waves which are coherent
(4) High speed electrons
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( 3 ) Light waves which are coherent
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Sir,I am rajkumar..I can completed b.tech with it branch i can apply for entrance exan ONGC graduation daharadun.In this exam sep 18.Its ok but iknow doubt sir...in this exam 1)general awarness butgeneral awareness and knowlege it same syllabus sir.... and how prepare general awareness ongc exam ....ple guid me sir send email chilukoti.rajkumar@gmail.com.and what books can be prepare tell fast sir..send me... thank you
