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Question 16 A source produces sound waves with a frequency off. As the source of sound moves away from an observer, the Not yet

Question 16 A source produces sound waves with a frequency off. As the source of sound moves away from an observer, the Not yet answered Marked out of Select one: 1.00 O a. observer hears sounds with a frequency less than f Flag question O b. source produces waves with a frequency less thanf O c. observer hears sounds with a frequency greater than f O d. source produces waves with a frequency greater than f