The Frequency Separating Audible Waves and Ultrasonic Waves Is Considered

question 7

Multiple Choice

The frequency separating audible waves and ultrasonic waves is considered to be 20 kHz.What wavelength in air at room temperature is associated with this frequency? (Assume the speed of sound to be 340 m/s. )

• A)1.7 cm
• B)5.2 cm
• C)34 cm
• D)55 cm

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