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Two ultrasonic sound waves combine and form a beat frequency that is in the range of human hearing (20 Hz to 20 kHz). The frequency of one of the ultrasonic waves is 50 kHz. What is the smallest possible value for the frequency of the other ultrasonic wave?

A.70 kHz
B.60 kHz
C.50 kHz
D.40 kHz
E.30 kHz

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