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Some crosswalk lights flash red as a warning to pedestrians not to cross the street (see photo below). What is the period of a flashing crosswalk that has a frequency of 1.5 Hz? Explain. Some crosswalk lights flash red as a warning to pedestrians not to cross the street (see photo below). What is the period of a flashing crosswalk that has a frequency of 1.5 Hz? Explain.

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