A Square Has Sides of Length L

question 8

Multiple Choice

A square has sides of length L.In the lower-right and lower-left corners there are two sources of light waves,one in each corner,that emit identical in-phase light waves of wavelength 8.28 m in all directions.What is the minimum value of L such that constructive interference occurs in the upper-right corner? Ignore any reflections.

• A)8.28 m
• B)10.0 m
• C)16.6 m
• D)20.0 m

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