Two Coherent Sources Emit Waves of 2

question 41

Multiple Choice

Two coherent sources emit waves of 2.0-m wavelength in phase.If the path length to an observer differs by ________,then _________ interference occurs.

• A) 1.0 m,constructive
• B) 2.0 m,destructive
• C) 3.5 m,constructive
• D) 7.0 m,destructive
• E) 8.0 m,destructive