Interference effects observed in the early 19th century were instrumental in supporting a concept of the existence of which property of light?

1. what aspect of washington's location does the peace arch monument stand for? a. the peace arch commemorates the victory over japan in world war llb. the peace arch pays tribut to early settlers in the regionc. the peace arch represents the peaceful relationship between united states and canadad. the peace arch symbolizes the agreement to limit trade between pacific rim countries2. what did early settlers in washingtion have few trade relationships with eastern states? 3. washingtions location along the pacific coast has affected the development of which of the following? 4. which of the follow is true about seattle? a. seattle is sparsely populatedb. seattle is home to many large companiesc. seattle is known for its contribution to the ranching industryd. seattle was the first area of washington to be seattle5. recall that the geography theme of place answers the question, whats it like there? to describe physical and human characteristics. which of the following statements describes washingtion as a place?