Respuesta :

Answer:

[tex]1.4\cdot 10^6 Hz[/tex]

Explanation:

The relationship between the frequency, the wavelength and the speed of a wave is given by the wave's equation:

[tex]v=f \lambda[/tex]

where

v is the speed of the wave

f is the frequency

[tex]\lambda[/tex] is the wavelength

For the pulse in this problem,

[tex]\lambda = 1.0 mm = 0.001 m\\v = 1400 m/s[/tex]

Solving for  f, we find the frequency:

[tex]f=\frac{v}{\lambda}=\frac{1400}{0.001}=1.4\cdot 10^6 Hz[/tex]