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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



Lasers are widely used in various walks of life. These are sources of (1) Sound waves of very hi..

Answer / guest

( 3 ) Light waves which are coherent

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