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) 0.59 cm
B) 1.7 cm
C) 34 cm
D) 55 cm

Question

Quizplus · Accepted Answer

We can use the formula to calculate the wavelength,

wavelength = speed of sound / frequency

Substituting the given values,

wavelength = 340 / 20000

wavelength = 0.017 m (we have converted kHz to Hz)

Now, we can convert this to cm,

wavelength = 1.7 cm

Therefore, the wavelength associated with the given frequency is 1.7 cm, which is the option B).

The Frequency Separating Audible Waves and Ultrasonic Waves Is Considered