The figure below shows the circular wave fronts emitted by two sources. Make a t

Question

The figure below shows the circular wave fronts emitted by two sources. Make a table with rows labeled P, Q, and R and columns labeled r1, r2, ?r, and C/D. Fill in the table for points P, Q and R, giving distances as multiples of ? and indicating, with a C or a D, whether the interference at the point is constructive or destructive.

How do I even go about doing this?

The figure below shows the circular wave fronts emitted by two sources. Make a table with rows labeled P, Q, and R and columns labeled r1, r2, ?r, and C/D. Fill in the table for points P, Q and R, giving distances as multiples of ? and indicating, with a C or a D, whether the interference at the point is constructive or destructive.

Explanation / Answer

Each blue circle represents the crest of a wave, the middle of the space between circles is the trough.

Crest + trough = destructive interference, crest + crest or trough + trough = constructive interference.

Measure the r in terms of ?, the distance between crests

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