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

Question

Quizplus · Accepted Answer

The wavelength of a wave is given by the formula:$$\lambda = v/f$$where:* $$\lambda$$ is the wavelength in meters* v is the speed of the wave in meters per second* f is the frequency of the wave in hertzIn this problem, we are given that the frequency of the wave is 20 kHz and the speed of sound in air at room temperature is 340 m/s. Substituting these values into the formula, we get:$$\lambda = 340 m/s / 20 kHz = 0.017 m = 1.7 cm$$Therefore, the wavelength in air at room temperature associated with a frequency of 20 kHz is 1.7 cm.

The Frequency Separating Audible Waves and Ultrasonic Waves Is Considered