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Which statement best describes who the period and frequency of electromagnetic was change between gamma rays and microwaves? a) the period and frequency stay the same. b) the period increases and the frequency decreases. c) the period decreases and the frequency increases. d) the period increases and the frequency increases.

When a book falls from a shelf to the ground without anyone pushing on it, no work is done on the book. true or false

Which type of wave can travel without a medium