lecture27-interference part 2-

# lecture27-interference part 2- - What you will be able to...

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What you will be able to do a/er today … the condi4ons for construc4ve and destruc4ve interference the intensity varia4on for waves interfering Explain … if waves are interfering construc4vely or destruc4vely based on path diFerence and±or an ini4al phase diFerence Calculate … knowledge of how intensity changes with distance and see its connec4on to interference [email protected] Apply …

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Conditions for Constructive and Destructive Interference Constructive Interference Destructive Interference path difference (in meters) phase difference (in radians) ! x = m ! ! x = ( m + 1 2 ) ! = m ! 2 " ! = ( m + 1 2 ) ! 2 ! = 2 ! x # + ! 0
(a) What is the smallest distance for d for this to be true? (b) What other distances would still work (chose two). Two in-phase loud speakers separated a distance d emit 170 Hz sound waves along the x-axis. As you walk along the central axis (away from the speakers), you don’t hear any sound – even though both speakers are turned on. à

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## This note was uploaded on 01/15/2012 for the course PHYS 101 taught by Professor Bates during the Winter '08 term at UBC.

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lecture27-interference part 2- - What you will be able to...

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