The frequency separating audible waves and ultrasonic waves is considered to be 25 kHz.What wavelength in air at room temperature is associated with this frequency? (Assume the speed of sound to be 450 m/s. )
A) 1.8 cm
B) 81 cm.
C) 45 cm
D) 81 cm
E) 112.5 cm
Correct Answer:
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