Most ultrasound technicians train in an associates degree, but can also get a bachelors degree in the field. There is also certification programs you can go through. Hope this helped!!! :)
 
        
             
        
        
        
The frequency of the wave has not changed.
In fact, the frequency of a wave is given by:

where v is the wave's speed and  is the wavelength.
 is the wavelength.
Applying the formula:
- In air, the frequency of the wave is:

- underwater, the frequency of the wave is:

So, the frequency has not changed.
 
        
                    
             
        
        
        
Answer:
it Give only one of them a positive or negative charge
 
        
                    
             
        
        
        
Explanation:
Electromagnetic waves are waves that propagate through space while an electric field and a magnetic field interact with each other.
please mark as brainliest plzz