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Physical Science Crossword Puzzle(Part 2)

Across
Cells in the retina that detect shape in dim light
The response of a standing wave to another wave of the same frequency
Any motion that repeats at regular time intervals
Two or more waves overlap and combine together
Down
A change in sound frequency caused by motion of the sound source, motion of the listener, or both
A point where a crest trough occurs midway between two nodes
A physical response to the intensity of sound