84-20=64 smallest
84+20=104 largest
Two ultrasonic sound waves combine and form a beat frequency that is in the range of human hearing for a healthy young person. The frequency of one of the ultrasonic waves is 84 kHz. (The range of hearing for a healthy young person is 20 Hz to 20 kHz.)
(a) What is the smallest possible value for the frequency of the other ultrasonic wave?
(b) What is the largest possible value for the frequency of the other ultrasonic wave?
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