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

$wavelength = \frac{speed}{frequency}$

now we will have

$speed = 340 m/s$

$frequency = 25 kHz = 25 \times 10^3 Hz$

now we plug in all data in above equation

$\lambda = \frac{340}{25 \times 10^3}$

$\lambda = 0.014 m$

$\lambda = 1.4 cm$

so here wavelength will be 1.4 cm