Sonar is used to determine the speed of an object. A 38.0-kHz signal is sent out, and a 40.0-kHz signal is returned. If the speed of sound is 341 m/s, how fast is the object moving?

The velocity is  

Explanation:

From the question we are told that

    The frequency of the signal sent out  is  

    The frequency of the signal received is  

     The  speed of sound is  

Generally the frequency of the sound received is  mathematically represented as

where v is the velocity of the object

       =>      

       =>      

       =>  

      =>    

      =>    

come closer and become far apart and become steam/gas

heat the gas and measure the pressure