Question

One brand of dog whistles claims a frequency of 25 kHz for its product. What is the wavelength of this sound?

a 2.0
b 0.7
c 3.6
d 1.4

Answer 1

Wavelength of sound is given as

`wavelength = (speed)/(frequency)`

now we will have

`speed = 340 m/s`

`frequency = 25 kHz = 25 * 10^3 Hz`

now we plug in all data in above equation

`\lambda = (340)/(25 * 10^3)`

`\lambda = 0.014 m`

`\lambda = 1.4 cm`

so here wavelength will be 1.4 cm